Factor 1 Base

These base layers are manufactured using patterns based on the Meraklon range. They should be worn snugly but not restrictive. Unisex leggings (no Fly) are only produced currently in this range.

Chest Inches 28-31 32-34 35-37 38-40 41-42 43-45
Chest CM 71-79 81-87 89-94 97-102 104-107 109-114
Back drop inches 24 26 28 30 32 33
Back drop cm 61 66 71 76 81 84
waist inches 26-28 29-31 32-34 35-37 38-40 41-42
waist cm 66-71 74-79 81-87 89-94 97-102 104-107
inside leg inches 24 27 28 29 30 31
inside leg cm 61 66 71 76 81 84
womens uk 6 8-10 12 14 16 18
womens european 34 36-38 40 42 44 46

Sub Zero Factor 1 Leggings Base Layers


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Sub Zero Factor 1 Unisex Leggings Base Layers are manufactured from tubular 100% polyamide fabric that eliminates the need for side seams on the outer edge of the bottoms, and requiring just one flat seam to seal the inner legs and gusset. On the bottom of the legs are flat ankle seams that help to reduce pressure exerted from walking shoes and ski boots.

All of the Factor 1 base layer leggings have extra generous waist heights that prevent lower back exposure and give extra thermal protection to your kidneys. The waist itself is constructed with an internal strong rubber elastic core that is seamed over with Factor 1 fabric for a low profile. The double layered fabric gusset provides added thermal protection around the groin.

Sub Zero Factor 1 base layer leggings are one of the best quality thermal underwear bottoms you could wear when performing in any outdoor sports. They are ideal for anything from running through to rock climbing, and are also very versatile as they can be paired with the Sub Zero Factor 2 thermal mid layer underwear range for extra warmth in extreme conditions


Made in: England

Sun protection factor: 50+

TOG rating: 0.42

Fabric: 100% Polyamide

Average weight: 130g / 4.6oz

Fit: Unisex snug

Layer: First - next to the skin

Size availability: XSmall-2XLarge

Colours: Black, White, Khaki, Cobalt blue

Fabric treatments: Hydrophilic impregnated

Washing instructions: 40°C wash with mild detergent, do not tumble dry, iron on low setting



1 Reviews






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Jun 11, 2019

The best on the market

The best on the market. I have been wearing a sub zero factor one thermals for 30 years and can honestly say with hand on heart you will not buy anything better regardless of price. I still wear my original pair from mid 1980s despite a few holes caused by Barbwire over the years. Super quick drying and an absolute must for any outdoor activity.


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