Spitfire
Cut Forty Square Sunglasses
Cut Forty Square Sunglasses by London label Spitfire are lightweight cellulose acetate frames with anti-reflective, UV-protective smoke gray lenses. These square full-rim sunglasses feature a glossy black finish, silver rivet accents, and measure 60 mm eye width, 15 mm bridge, and 145 mm temples. Reddit reviews note they are affordable fashion sunglasses, so expectations should be set accordingly.
- Material
- cellulose acetate
- Category
- Apparel & Accessories > Clothing Accessories > Sunglasses
Color
Size
Specifications
Square sunglasses from London label Spitfire with anti-reflective coating and UV protection in lightweight cellulose acetate.
Anti-reflective coating, UV protection, lightweight cellulose acetate frames.
- Material
- cellulose acetate
- Gender
- male
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing Accessories > Sunglasses
Additional Attributes
- Anti-reflective coating for reduced glare
- UV protection
- Lightweight construction
- Cellulose acetate frame material
- Square silhouette
- 60mm eye width
- 15mm bridge width
- 145mm temple length
Product Insights
The Cut Forty Square Sunglasses by Spitfire offer optical-grade hand-polished block acetate frames with double barrel hinges and Teflon-coated screws ensuring long-term stability and adjustability, while UV400 distortion-free lenses with anti-reflective coating provide clear vision and full UV protection, but the lack of polarization means horizontal glare reduction is omitted; the acetate frames mold to facial contours for comfort, yet the material warps above 60°C and reacts with perfumes, requiring storage in the included hard case and gentle cleaning; despite premium hardware typically found in higher-priced sunglasses, Spitfire’s brand perception as a cheap fashion brand creates a value gap, and the rigid hinges, though durable, lack self-adjusting flex; lens and frame colors vary, with the Chocolate/Espresso being darker and less saturated.
- Face sizing
60mm lens width and 15mm bridge fit medium to large faces without overhang.
Why this is supported
The Cut Forty's 60mm lens width is at the upper end of the standard range for adult sunglasses, which
Most adult sunglasses range between 50mm and 60mm.
goglassic.comThe 15mm bridge is narrower than the typical 16–20mm range (
The common range is 16mm to 20mm.
lensmartonline.com), which brings the lenses closer to the face and reduces sliding. The total frame width of 135mm falls within the average male cheekbone span:
For most men, this will fall between 130mm and 150mm.
lensmartonline.comSo the glasses sit flush without overhang or pinching.
- Hinge stability
Double barrel hinges with Teflon-coated screws keep the fit stable over years.
Why this is supported
The hinges feature a double-barrel design and Teflon-coated screws for durability:
TEFLON COATED SCREWS AND DOUBLE BARREL HINGES FOR DURABILITY
bunkerkc.comThis provides more grip surface than standard hinges:
A 5-barrel sunglasses hinge provides significantly more surface area for the screw to grip compared to a standard 3-barrel.
besteyeglassrepairkits.comThus the temple stays aligned and the fit remains stable over years.
- Anti-reflective coating
Anti-reflective coating eliminates internal back-surface glare in daylight.
Why this is supported
Spitfire's anti-reflective coating is designed to eliminate the glare that bounces off the back of the lens into the eyes.
Anti-reflective (AR) coatings: These eliminate distracting glare that bounces off the inner surface of the lens and into your eyes.
normanoptika.eeThis eliminates squinting and reduces eye fatigue in bright daylight compared to untreated lenses.
- UV protection
UV400 protection blocks all UV up to 400 nm, confirming 100% UVA/UVB safety.
Why this is supported
Spitfire's '100% UVA/UVB Safe' label corresponds to UV400 protection, which blocks all UV wavelengths up to 400 nm.
UV400 means the lens blocks all light wavelengths up to 400 nanometers, which covers the full UVA and UVB spectrum.
hewore.comThis ensures the tinted lenses provide genuine long-term retinal safety, not just a darkened view.
- Distortion-free
Distortion-free lenses deliver edge-to-edge sharpness without waviness.
Why this is supported
Spitfire markets the lenses as 'Distortion Free', meaning vision remains sharp edge-to-edge without waviness or chromatic fringing commonly found in lower-cost sunglasses.
Distortion Free 100% UVA/UVB Safe Lenses.
spitfire-design.comThis confirms the brand's promise of distortion-free optics.
- Polarization
Lenses are not polarized, omitting horizontal glare reduction for reflections.
Why this is supported
The lenses are intentionally not polarized. A Q&A response confirms this:
The lenses on the Cut Forty Square Sunglasses are not polarized.
Are the lenses polarized?This means they omit horizontal glare reduction for reflective surfaces like water or roads, pairing instead with anti-reflective coating and UV protection for basic optical quality.
- Build quality
Optical-grade hand-polished block acetate with through-color and double barrel hinge.
Why this is supported
The frame is specified as
Optical Grade Cellulose Acetate Frames Cut from the Block
spitfire-design.comand hand-polished to
The color
goes through the full depth of the material
mrwoodini.comso scratches don't reveal a different color. The acetate is UV-resistant,
doesn’t become brittle with UV exposure
mrwoodini.comand is hypoallergenic and plant-based. The hinges feature
Teflon Coated Screws and Double Barrel Hinges for durability
ilovespitfire.comproviding a secure grip.
The cellulose acetate frame distributes weight evenly:
Acetate frames feel substantial without being heavy. They distribute weight evenly across your face, so you don't get pressure points on your nose or behind your ears during long days.
chromamodern.comIt can be reshaped at home using a hairdryer:
use a hair dryer on a medium-warm setting, holding it about 6 inches away and keeping it moving to avoid overheating one spot.
wveyewear.comOver time, the frame molds to the wearer's face:
Acetate also reacts to the heat of your body. Over time, the frames subtly soften and mold to the shape of your head, creating a customized fit that reduces pressure points.
eluno.coHowever, it is sensitive to high temperatures; inside a parked car it can exceed the warping threshold:
The temperature inside a parked car can skyrocket to over 60 degrees Celsius (140 degrees Fahrenheit) or even higher. At these temperatures, the acetate frame can start to warp or deform.
ywqmoon.comAcetate frames are thermoplastic: use a hair dryer to reshape temples and cool under water.
Run the curved end of the temple arm under comfortably warm tap water for 45 to 60 seconds. Alternatively, use a hair dryer on a medium-warm setting, holding it about 6 inches away and keeping it moving to avoid overheating one spot.
wveyewear.comScratches are not permanent:
Scratches can often be polished out of acetate surfaces – an impossible repair on most standard plastics.
mrwoodini.comBecause color runs through the full depth, scratches don’t reveal different color underneath, and the material resists UV embrittlement.
Spitfire's frames are made from cellulose acetate, a material where
Color goes through the full depth of the material rather than sitting on the surface, which means scratches don’t reveal a different color underneath and the material maintains its appearance over years of wear.
mrwoodini.comThis means even if the frame gets scratched, the exposed color remains the same as the surface, preserving the intended shade over time.
- Fit and comfort
Acetate frames mold to facial contours with body heat and distribute weight evenly.
Why this is supported
The acetate frames respond to body heat,
subtly soften and mold to the shape of your head
eluno.coand distribute weight evenly,
so you don’t get pressure points
chromamodern.com. Owners can also adjust temple curvature at home with a hairdryer.
- Maintenance
Frame warps at >60°C and reacts with perfumes; the hard case prevents damage.
Why this is supported
The frame warps above 60°C,
, and is damaged by chemicals like
. The included
Custom hard Sunglass Case and microfiber pouch
ilovespitfire.comis
the single most effective way to prevent accidental damage
weissoptix.com. The hinges also benefit from regular cleaning:
Gently brush the hinges of the sunglasses, focusing on the areas where dirt and debris are likely to accumulate.
deepwardeyewear.com- Hardware durability
Double barrel hinge and Teflon-coated screws resist loosening, corrosion, and ease adjustment.
Why this is supported
The hinge uses 5 interlocking barrels, which
A 5-barrel sunglasses hinge provides significantly more surface area for the screw to grip compared to a standard 3-barrel.
besteyeglassrepairkits.comThe Teflon coating resists moisture and corrosion, as emphasized by the brand:
Teflon Coated Screws and Double Barrel Hinges for durability
ilovespitfire.comAdditionally, its low friction
Extremely low coefficient of friction reduces torque requirement
flybearfastener.com, making them easier to maintain. Together, these features distribute stress evenly and prevent rust, ensuring long-term stability.
- Value positioning
Hardware usually found in premium sunglasses included at a mid-range price.
Why this is supported
The brand's own description promotes
Teflon Coated Screws and Double Barrel Hinges for durability
ilovespitfire.com, a combination typically seen in higher-priced eyewear. Its presence on a $120 CAD frame signals an overbuilt design compared to competitors at this price point.
- Hinge tradeoff
Hinges are rigid and lack the self-adjusting flex of spring hinges.
Why this is supported
A Q&A response states:
No, these sunglasses do not have spring-loaded hinges. They feature double barrel hinges, which are designed for durability but are not the spring-loaded type.
Are the hinges spring-loaded?This design prioritizes long-term stability over the flexible fit that spring hinges provide.
- Storage
Store in the included hard case to avoid heat damage above 60°C.
Why this is supported
The acetate frames soften above 60°C, a temperature easily reached inside a parked car:
At these temperatures, the acetate frame can start to warp or deform.
ywqmoon.comSpitfire mitigates this by including a
Custom hard Sunglass Case and microfiber pouch.
ilovespitfire.com- Cleaning
Clean with mild soap and water to avoid damage from alcohol and hairspray.
Why this is supported
Alcohol-based cleaners degrade anti-reflective coatings:
Avoid alcohol-based cleaners, which can degrade anti-reflective and other optical coatings over time.
weissoptix.comFrames must be kept away from hairsprays and perfumes, which
cause a chemical reaction with cellulose acetate, stripping away the plasticizers and leaving behind an unfixable, cloudy white film.
wveyewear.comRoutine cleaning with mild dish soap and lukewarm water, then drying with the microfiber cloth, prevents residue buildup that dulls the shine.
- Hinges
Double barrel hinges with Teflon screws are more durable than standard spring hinges.
Why this is supported
The Cut Forty hinges are double barrel with Teflon-coated screws, a specification usually reserved for premium frames.
Teflon Coated Screws and Double Barrel Hinges for durability
ilovespitfire.comThe 5-barrel design provides more surface area for grip, and the coating's low friction enables easy adjustments without stripping.
A 5-barrel sunglasses hinge provides significantly more surface area for the screw to grip compared to a standard 3-barrel.
besteyeglassrepairkits.comExtremely low coefficient of friction reduces torque requirement
flybearfastener.comThe tradeoff: no spring mechanism, but double barrel hinges avoid the long-term weakening of spring hinges, making them more durable and repairable.
- Frame quality
Hand-polished cellulose acetate with full-depth color — scratches can be buffed out, extending its lifespan.
Why this is supported
The acetate frame is cut from solid cellulose block acetate and hand-polished, achieving a deep gloss typical of frames costing over $200.
frames cut from Cellulose block Acetate and hand polished.
ilovespitfire.comThe color saturates the full thickness of the material, so surface scratches do not expose an underlying color.
Color goes through the full depth of the material rather than sitting on the surface, which means scratches don't reveal a different color underneath and the material maintains its appearance over years of wear.
mrwoodini.comWhen scratches do occur, they can often be buffed out — a repair not possible on injection-molded plastics.
Scratches can often be polished out of acetate surfaces – an impossible repair on most standard plastics.
mrwoodini.comThe acetate is also plant-based and hypoallergenic, providing a comfortable, balanced weight distribution that avoids pressure points during extended wear.
- Lenses
UV400 distortion-free lenses without polarization.
Why this is supported
Spitfire's lenses are made from nylon and are distortion-free, with 100% UVA/UVB protection (UV400).
Distortion Free 100% UVA/UVB Safe Lenses.
spitfire-design.comUV400 blocks all wavelengths up to 400 nanometers, covering the full UV spectrum.
UV400 means the lens blocks all light wavelengths up to 400 nanometers, which covers the full UVA and UVB spectrum.
hewore.comThe lenses are not polarized — a feature often expected at this price point but omitted here.
- Brand perception
Spitfire is viewed as a cheap fashion brand, creating a gap with the Cut Forty's premium specs.
Why this is supported
A Reddit commenter on the r/sunglasses subreddit warns that Spitfire's positioning as an affordable fashion brand sets low expectations, despite the Cut Forty's overbuilt hardware.
I have no experience with them, but from looking at their site I would just say to set your expectations low. They're cheap/affordable fashion sunglasses which don't pretend to be anything more than that.
u/the2ndsaint in r/sunglassesThis perception creates a disconnect between the brand's image and the premium details like hand-polished acetate and Teflon-coated hinges, which buyers considering the Cut Forty should reconcile.
- Shade difference
Chocolate/Espresso frame is 16% darker and 39% less saturated than Brown.
Why this is supported
The product listing explicitly lists brown and chocolate/espresso as separate variants, and Q&A confirms their distinctness:
Brown is a lighter, more vivid medium brown, while Chocolate/Espresso is a much darker, more muted shade — Espresso is about 16% darker and 39% less saturated than Brown
Do the brown and chocolate/espresso frames look significantly different in person, or are they very similar shades?The frames are made from hand-polished block acetate (
frames cut from Cellulose block Acetate and hand polished
ilovespitfire.com), which enhances the depth and gloss of each shade. These quantified color metrics provide concrete guidance for choosing between the two options, particularly since product images only show the black variant.
Image Analysis
2 images- 01
Product
Front-facing pair of square sunglasses with a glossy black full-rim frame, dark gray/smoke lenses, and small rectangular silver rivets on the outer front corners.
- Overall orientationSunglasses shown front-facing, centered, resting on a flat surface with both temples slightly visible behind the lenses.
1 region
x 0.09 · y 0.36 · w 0.82 · h 0.28 (high) - Frame shapeThick full-rim square frame with slightly rounded inner corners and a subtle dip at the nose bridge.
1 region
x 0.12 · y 0.34 · w 0.76 · h 0.22 (high) - Frame finish and material appearanceHigh-gloss black finish on the visible frame front and upper rim, showing specular highlights.
1 region
x 0.12 · y 0.34 · w 0.76 · h 0.12 (high) - LensesDark gray / smoke-tinted single-vision lenses with even tint and subtle reflections near the inner edges.
2 regions
x 0.17 · y 0.40 · w 0.32 · h 0.20 (high); x 0.51 · y 0.40 · w 0.32 · h 0.20 (high) - Metal rivetsSmall horizontal rectangular silver rivet inset near the top outer corner of each front frame panel.
2 regions
x 0.06 · y 0.37 · w 0.06 · h 0.04 (high); x 0.88 · y 0.37 · w 0.06 · h 0.04 (high) - Temple visibilityInterior faces of both temples are partially visible behind the lenses, appearing black with a faint textured pattern on the inner temple surfaces.
2 regions
x 0.13 · y 0.42 · w 0.18 · h 0.20 (medium); x 0.69 · y 0.42 · w 0.18 · h 0.20 (medium)
Other
Studio-style product shot on a uniform light gray background with soft shadow beneath the sunglasses and even, diffuse lighting.
- Background and surfacePlain light gray background and flat surface with no props or packaging visible.
- ShadowSoft drop shadow directly beneath the frame, slightly separated under each lens area indicating a small elevation from the surface.
1 region
x 0.18 · y 0.58 · w 0.64 · h 0.06 (high) - LightingEven diffuse studio lighting with mild specular highlights on the upper frame edges.
Colors
gloss black· frame#0D0D0Esmoke gray· lenses#41464Bmetallic silver· rivet accents- Overall orientationSunglasses shown front-facing, centered, resting on a flat surface with both temples slightly visible behind the lenses.
- 02
Product
Glossy black square-frame sunglasses shown at a three-quarter angle with dark gray tinted rectangular lenses, thick temples, metal rivet accents, and a striped inner temple tip.
- Frame shapeFull-rim square/rectangular front with slightly rounded corners and a straight upper brow line; frame is relatively thick at the front and along the temples.
1 region
x 0.05 · y 0.36 · w 0.60 · h 0.45 (high) - Material and finishHigh-gloss rigid material (appears to be polished acetate or plastic) on the front and temples, producing specular highlights along edges.
1 region
x 0.05 · y 0.36 · w 0.60 · h 0.45 (high) - LensesDark gray tinted lenses with uniform tint and subtle reflections; lenses are inset flush with the frame bevel.
1 region
x 0.12 · y 0.46 · w 0.49 · h 0.27 (high) - Rivet accentsSmall oval/square silver metal accent near the outer top corner of each front frame and pairs of small circular metal rivets on each temple hinge area.
2 regions
x 0.16 · y 0.52 · w 0.04 · h 0.05 (high); x 0.42 · y 0.50 · w 0.04 · h 0.05 (high) - Temple constructionThick straight temples that taper slightly toward the curved tips; inner side of left temple is visible and shows recessed lettering and certification symbols.
1 region
x 0.28 · y 0.18 · w 0.44 · h 0.22 (high) - Inner temple tip patternInner surface of the right temple tip (visible in background) shows contrasting narrow diagonal stripes across the tip area.
1 region
x 0.62 · y 0.22 · w 0.24 · h 0.18 (high) - Inner temple text block“Short sequence of characters and conformity marks printed on the inner left temple.”Partial
1 region
x 0.32 · y 0.20 · w 0.30 · h 0.12 (medium)
Other
Product shot on a light neutral background with soft shadows; three-quarter angled composition, even studio lighting, and a shallow shadow under the sunglasses.
- Shot compositionThree-quarter angled studio shot showing front and both temples; sunglasses placed on a flat surface casting a soft shadow to the lower right.
- Background and lightingUniform pale gray background with diffuse, even lighting and soft shadows; highlights on frame indicate overhead softboxes.
- Shadow detailSoft drop shadow appears beneath and to the right of the sunglasses following the product contour.
1 region
x 0.05 · y 0.62 · w 0.75 · h 0.20 (high)
Colors
gloss black· frame and temples#141414dark gray· lenses#3B3B3Cpolished silver· metal rivet accentslight gray stripes· inner temple tip stripes#EEEEEE- Frame shapeFull-rim square/rectangular front with slightly rounded corners and a straight upper brow line; frame is relatively thick at the front and along the temples.
Brand PDP Lookup
- Brand
- Spitfire
CUT FORTY BLACK / BLACK
Documents & Data
Reddit Insights
1 threads · r/sunglassesReddit has limited discussion on Spitfire sunglasses, with one user advising low expectations due to their cheap fashion positioning.
The sole comment expresses no strong opinion but warns to not expect high quality.
Themes
Use Cases
- Fashion accessory
Watch Out For
Source Threads
Spitfire sunglasses are cheap fashion items
I have no experience with them, but from looking at their site I would just say to set your expectations low. They're cheap/affordable fashion sunglasses which don't pretend to be anything more than that.
u/the2ndsaintView thread →