
I.FIV5
Responsible Merino Wool Thermal Legging
The i.FiV5 by Simons Responsible Merino Wool Thermal Legging is a full-length, high-rise base-layer legging made from a 180 g/m2 merino wool blend knit, designed for moderate to cold weather wear during athletic and outdoor activity. The fabric is moisture-wicking, temperature-regulating and odour-resistant, and the garment features a stretch elastic waistband with printed i.FiV5 branding, a functional fly with contoured front seams, flatlock leg seams, a center back seam, a reflective i.FiV5 logo and fitted ankle cuffs. The merino wool is sourced from farms certified for responsible practices, and the black legging is designed in Canada as an exclusive i.FiV5 style.
- Material
- 180 g/m2 merino wool blend
- Gender
- male
- Style
- minimal, activewear, athleisure, layering-piece, technical, lightweight
- Category
- Apparel & Accessories > Clothing > Activewear
Color
Specifications
Merino wool thermal leggings designed as a lightweight, technical base layer for moderate to cold conditions.
180 g/m2 merino wool blend, moisture-wicking, temperature-regulating, odour-resistant, stretch waistband, functional fly, reflective i.FiV5 logo, high rise.
- Material
- 180 g/m2 merino wool blend
- Style
- minimal, activewear, athleisure, layering-piece, technical, lightweight
- Occasion
- workout, hiking, travel, everyday
- Gender
- male
- Age Group
- adult
- Condition
- new
- Category
- Apparel & Accessories > Clothing > Activewear
Additional Attributes
- 180 g/m2 merino wool technical knit
- Merino wool sourced from farms certified for responsible practices
- Lightweight thermal base layer for moderate to cold weather
- Moisture-wicking fabric
- Temperature-regulating fabric
- Odour-resistant material
- Stretch waistband
- Signature logo on waistband
- Functional fly
- Reflective i.FiV5 logo
- High-rise silhouette
- Clean and effortless silhouette
- Exclusive i.FiV5 by Simons style designed in Canada
Product Insights
83% responsible merino wool, 12% polyamide, 5% elastane 180 g/m2 merino suits moderate-to-cold three-season use Do not tumble dry; reshape and lay flat to dry; do not iron Fitted base-layer cut; size by waist and hip measurements Middle weight: warmer than 150 gsm, less insulating than 200–230 gsm
Verified claims
- fit
- Fitted base-layer cut; size by waist and hip measurements
- silhouette
- High-rise, full-length legging with tapered ankle cuffs
- construction
- Flatlock seams, contoured fly, and center back seam
- waistband
- Approx. 1.5-inch stretch waistband with repeated I.FIV5 branding
- fabric weight
- 180 g/m2 merino suits moderate-to-cold three-season use
- temperature regulation
- Merino buffers heat and humidity rather than only adding warmth
- moisture management
- Absorbs sweat vapour and resists feeling damp
- odour resistance
- Merino fibre structure binds odour molecules until washing
- care — washing
- Machine wash cold on delicate, inside out; no bleach or fabric softener
- care — drying
- Do not tumble dry; reshape and lay flat to dry; do not iron
- durability
- Polyamide and elastane are added to improve abrasion resistance and recovery
- comfort
- Merino softness depends on fibre fineness and knit; sensitive skin may still notice itch
- styling
- Clean black silhouette can work as a base layer or a standalone active tight
- suitable uses
- Built as a first layer for cool-weather hiking, skiing, commuting and travel
- tradeoff
- Middle weight: warmer than 150 gsm, less insulating than 200–230 gsm
- value
- 89 CAD buys a certified merino blend with flat pricing across sizes
- variants
- Black only, in SMALL through X-LARGE
- sourcing
- Merino comes from farms certified for responsible practices
- maintenance
- Airing between wears can refresh the garment and reduce washing
Product record
- Title
- Responsible Merino Wool Thermal Legging
- Brand
- I.FIV5
- Price
- 89 CAD
- Availability
- In stock
Buying Guide
0 comparisons · 1 sourceUses
A merino base layer for moderate to cold days
Pull on these merino wool thermal leggings as a base layer when heading out in moderate to cold weather. The lightweight 180 merino blend is moisture-wicking and temperature-regulating, and the wool naturally resists odour, making it easy to wear through long days outdoors.[1]
Image Analysis
2 images- 01

Product
Front view of a pair of black fitted thermal leggings worn by a model; visible elastic waistband with printed branding, contoured front fly seam and flatlock stitching, and fitted ankle cuffs.
- Overall silhouetteFitted, full-length leggings with a slim tapered leg that narrows to the ankle; worn on a standing model and shown from the front.
1 region
x 0.18 · y 0.08 · w 0.64 · h 0.84 (high) - WaistbandApproximately 1.5 inch wide elastic waistband in the same black color with repeated glossy printed branding across its front.
1 region
x 0.22 · y 0.06 · w 0.56 · h 0.11 (high) - Waistband text“I.FIV5”
1 region
x 0.40 · y 0.07 · w 0.20 · h 0.08 (high) - Front seam and flyContoured front fly panel and curved seams running from the waistband down through the crotch, visible as slightly raised stitch lines.
1 region
x 0.34 · y 0.22 · w 0.32 · h 0.28 (high) - StitchingFlatlock or visible stitch lines follow the leg seams on the inner and outer thigh, contrasting subtly in texture but same color as fabric.
1 region
x 0.26 · y 0.22 · w 0.48 · h 0.62 (high) - Ankle finishFitted ankle hem with the fabric gathered slightly above the sock line, forming a narrow cuff.
1 region
x 0.20 · y 0.78 · w 0.60 · h 0.14 (high) - Fabric appearanceMatte, fine-knit textured fabric consistent with a thermal or base-layer knit.
1 region
x 0.22 · y 0.18 · w 0.56 · h 0.60 (high)
Other
Studio product shot showing the model from waist to feet against a plain light background; separate colored socks and part of a top are visible and the lighting is even with soft shadows under the feet.
- Shot compositionCropped mid-waist to feet, centered framing on the legs, with the model standing straight and both hands visible at sides.
1 region
x 0.10 · y 0.00 · w 0.80 · h 1.00 (medium) - BackgroundEven, neutral light gray to white studio background with no visible props besides the model's clothing and socks.
- Additional clothing itemsBright blue and orange patterned socks and a black long-sleeve top are visible but are separate garments from the product.
1 region
x 0.12 · y 0.76 · w 0.76 · h 0.24 (high) - Lighting and shadowSoft, even studio lighting with a subtle shadow under the model's feet to the front and slightly to the right.
Colors
black· main body- Overall silhouetteFitted, full-length leggings with a slim tapered leg that narrows to the ankle; worn on a standing model and shown from the front.
- 02

Product
Rear view of a pair of fitted black thermal leggings on a model, showing the back seam, elastic waistband, and ankle cuffs.
- Overall silhouetteFitted full-length legging silhouette shown from the rear, closely following the model's legs and hips with a visible center back seam running from the waistband down through the crotch area.
1 region
x 0.12 · y 0.08 · w 0.76 · h 0.84 (high) - WaistbandElastic waistband sits at the natural waist, slightly shinier than the leg fabric and forming a narrow horizontal band across the top of the garment.
1 region
x 0.22 · y 0.06 · w 0.56 · h 0.08 (high) - Back seamSingle vertical stitched seam runs down the center back from the waistband through the crotch to the upper thigh area.
1 region
x 0.45 · y 0.12 · w 0.10 · h 0.36 (high) - Ankle finishLeg openings terminate at the ankles with a narrow cuff, the fabric appearing slightly gathered above the sock line on both legs.
1 region
x 0.18 · y 0.78 · w 0.64 · h 0.16 (high) - Waistband text“IFIV5”Partial
1 region
x 0.29 · y 0.06 · w 0.42 · h 0.06 (medium)
Other
Studio rear shot of the model against a plain light background; model wears patterned blue socks and a long-sleeve top, hands visible at sides.
- Shot compositionStudio photograph showing the model from upper back to feet, centered in frame with the product occupying most of the vertical space.
- BackgroundEven light grey to white seamless background with no visible props or environmental context.
- Model hands visibleBoth of the model's hands are visible at the sides, cropped just above the wrists for the left hand and at the wrist for the right hand.
2 regions
x 0.05 · y 0.18 · w 0.16 · h 0.26 (high); x 0.79 · y 0.18 · w 0.12 · h 0.25 (high) - Socks and feetModel wears bright blue patterned socks with orange heel accents; feet rest flat on the studio floor.
1 region
x 0.20 · y 0.86 · w 0.63 · h 0.12 (high)
Colors
black· main fabric- Overall silhouetteFitted full-length legging silhouette shown from the rear, closely following the model's legs and hips with a visible center back seam running from the waistband down through the crotch area.
Variants
4 SKUs| SKU | Title | Price | Avail |
|---|---|---|---|
| 4714283 | Responsible Merino Wool Thermal Legging - Black - Small | CA$89.00 | Yes |
| 4714284 | Responsible Merino Wool Thermal Legging - Black - Medium | CA$89.00 | Yes |
| 4714285 | Responsible Merino Wool Thermal Legging - Black - Large | CA$89.00 | Yes |
| 4714286 | Responsible Merino Wool Thermal Legging - Black - X-Large | CA$89.00 | Yes |