Lou Rectangular Sunglasses

The Lou Rectangular Sunglasses by French Kiwis, priced at $150, are crafted from Italian Mazzucchelli acetate sourced from a mill operating since 1849, offering a repolishable frame that can be refinished by an optician to restore its gleam. This heritage material provides lasting color and justifies the cost, but the acetate frame is sensitive to heat above 50°C, which can cause permanent warping, and is vulnerable to damage from chemicals like ammonia, alcohol, and certain sunscreens. The sunglasses feature UV400/AR lenses with polarization optional at some retailers, and their rectangular shape adds angular contrast to round and oval faces while softening square faces. Daily care requires using only the supplied microfiber cloth to avoid micro-scratches, and the rigid case protects the frame from heat and direct sunlight.

Polarization

UV400/AR lenses; polarization optional at some retailers.

Why this is supported

The brand's official Q&A states that the Lou stock lenses are not polarized:

The lenses are not polarized; they come with 100% UV protection and anti-reflective coating, but polarization is an optional upgrade available in some retailers.Are the lenses polarized?

This confirms that the stock lenses block UV rays and reduce back-glare but do not filter horizontal glare from water or snow. The optional upgrade for polarization is available at select retailers, making the $150 base price a mid-level offering with polarization as an additional cost feature.

Face shape

Adds angular contrast to round and oval faces; also softens square faces.

Why this is supported

The brand's Q&A states that the rectangular frame's angular silhouette adds contrast to round and oval faces and can also complement square faces by softening their angles.

Heat warp

Acetate frame can soften and warp if left in a hot car, altering fit.

Why this is supported

The acetate material is heat-sensitive:

Acetate frames begin to soften around 50°C (122°F), a temperature easily reached inside a parked car; leaving the Lou on the dash can cause irreversible temple splay even inside the case — a five-minute errand is enough on a hot day.How to care for acetate sunglasses — 50_c_warp_danger

This warp can alter the intended rectangular silhouette and compromise fit over time.

Repolishing

Mazzucchelli acetate can be refinished by optician to restore gleam.

Why this is supported

The frame material allows for restoration:

Unlike thermo-injected frames, Mazzucchelli acetate can be refinished by an optician using a buffer and wax, restoring the original gleam — a repolishing service effectively gives the Lou a second life when surface wear accumulates.How to care for acetate sunglasses — optician_repolishing

This repolishing can restore the visual impact of the rectangular silhouette.

Material

Italian Mazzucchelli acetate from a mill operating since 1849, layered for lasting color and repolishable.

Why this is supported

Catalog verified that the Lou's frame uses Mazzucchelli acetate, a material whose layered construction gives rich color depth that will not fade. Evidence from a deep-research guide states,

Mazzucchelli Varese has been producing cellulose acetate since 1849, and their modern sheets are layered for rich color depth that holds up for decadesHow to care for acetate sunglasses — 1849_mazzucchelli_lineage

Furthermore, the frame can be repolished to restore its original gloss:

Mazzucchelli acetate can be refinished by an optician using a buffer and wax, restoring the original gleam — a repolishing service effectively gives the Lou a second life when surface wear accumulatesHow to care for acetate sunglasses — optician_repolishing

These properties confirm the material's durability and quality.

Care instructions

Protect from heat >50°C, chemicals; use only microfiber; case shields from sun.

Why this is supported

The acetate frame requires specific care to maintain its appearance. Evidence shows that

Acetate frames begin to soften around 50°C (122°F), a temperature easily reached inside a parked car; leaving the Lou on the dash can cause irreversible temple splay even inside the caseHow to care for acetate sunglasses — 50_c_warp_danger

. For daily cleaning, only one tool is recommended:

The supplied microfiber cloth is the only safe tool for daily cleaning: cotton t-shirts, paper towels, or synthetic wipes can embed micro-scratches in the acetate's high-gloss surface, dulling its polished look within months.How to care for acetate sunglasses — microfiber_only_wiping

Chemical exposure is another concern:

Ammonia-based glass cleaners, alcohol-heavy hand sanitizers, and some sunscreens can attack the plasticizers in acetate, causing a fine network of cracks called crazing; wiping the Lou down with a damp cloth after exposure prevents permanent damage.How to care for acetate sunglasses — chemical_crazing_risk

Finally, the rigid case is not mere packaging:

layered for rich color depth that holds up for decades — but only if shielded from prolonged direct sunlight, which is why the Lou's rigid case matters as more than just packaging.How to care for acetate sunglasses — 1849_mazzucchelli_lineage

Following these care steps preserves the frame's integrity.

Value

$150 price justified by heritage Italian acetate from 1849 mill; repolishable for extended life.

Why this is supported

The $150 price is substantiated by the quality of the acetate. Research notes that

Mazzucchelli Varese has been producing cellulose acetate since 1849, and their modern sheets are layered for rich color depth that holds up for decadesHow to care for acetate sunglasses — 1849_mazzucchelli_lineage

Additionally, the frames are not disposable:

Mazzucchelli acetate can be refinished by an optician using a buffer and wax, restoring the original gleam — a repolishing service effectively gives the Lou a second life when surface wear accumulatesHow to care for acetate sunglasses — optician_repolishing

This heritage and repairability offer long-term value consistent with the price.

Heat and sunlight

The frame needs the rigid case to avoid damage from heat above 50°C and direct sunlight.

Why this is supported

The care guide notes that

Acetate frames begin to soften around 50°CHow to care for acetate sunglasses — 50_c_warp_danger

, and that the frame's colour depth lasts decades

only if shielded from prolonged direct sunlightHow to care for acetate sunglasses — 1849_mazzucchelli_lineage

, so the rigid case is essential for daily storage.

Chemical damage

Ammonia, alcohol, and some sunscreens cause acetate crazing.

Why this is supported

The guide states that

Ammonia-based glass cleaners, alcohol-heavy hand sanitizers, and some sunscreens can attack the plasticizers in acetateHow to care for acetate sunglasses — chemical_crazing_risk

, so these chemicals should be kept away from the frame.

Cleaning method

During daily cleaning, only the microfiber cloth should touch the frame.

Why this is supported

The guide emphasizes that

The supplied microfiber cloth is the only safe tool for daily cleaningHow to care for acetate sunglasses — microfiber_only_wiping

, as other materials can embed micro-scratches that dull the surface.

Cleaning cloth

Only the supplied microfiber cloth should be used; other fabrics cause micro-scratches.

Why this is supported

Deep research confirms that

The supplied microfiber cloth is the only safe tool for daily cleaningHow to care for acetate sunglasses — microfiber_only_wiping

. This prevents micro-scratches that would otherwise dull the polished finish over time.

Restoration

Lou's Mazzucchelli acetate frame can be professionally repolished.

Why this is supported

The Lou's Mazzucchelli acetate frame can be professionally repolished by an optician.

Unlike thermo-injected frames, Mazzucchelli acetate can be refinished by an optician using a buffer and wax, restoring the original gleam — a repolishing service effectively gives the Lou a second life when surface wear accumulates.How to care for acetate sunglasses — optician_repolishing

Daily care is essential to maintain the surface for future repolishing.

The supplied microfiber cloth is the only safe tool for daily cleaning: cotton t-shirts, paper towels, or synthetic wipes can embed micro-scratches in the acetate's high-gloss surface, dulling its polished look within months.How to care for acetate sunglasses — microfiber_only_wiping

Chemical exposure can cause crazing.

Ammonia-based glass cleaners, alcohol-heavy hand sanitizers, and some sunscreens can attack the plasticizers in acetate, causing a fine network of cracks called crazing; wiping the Lou down with a damp cloth after exposure prevents permanent damage.How to care for acetate sunglasses — chemical_crazing_risk

The rigid case protects from UV light, preserving the acetate's color depth for consistent repolishing.

Mazzucchelli Varese has been producing cellulose acetate since 1849, and their modern sheets are layered for rich color depth that holds up for decades — but only if shielded from prolonged direct sunlight, which is why the Lou's rigid case matters as more than just packaging.How to care for acetate sunglasses — 1849_mazzucchelli_lineage

Heat sensitivity

Acetate frame softens above 50°C, causing permanent distortion.

Why this is supported

Acetate frames are sensitive to high temperatures.

Acetate frames begin to soften around 50°C (122°F), a temperature easily reached inside a parked car; leaving the Lou on the dash can cause irreversible temple splay even inside the case — a five-minute errand is enough on a hot day.How to care for acetate sunglasses — 50_c_warp_danger

This damage cannot be reversed by repolishing.