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Minus33 Merino Wool Clothing, Minus33 Merino Wool Men's Kancamagus Midweight Bottom

Minus33 Merino Wool Men's Kancamagus Midweight Bottom

100% Merino Wool

CAD $48.23
MERIWOOL, Elementex Merino Wool Men's 250g Midweight Crew - Choose Your Size & Color

Elementex Merino Wool Men's 250g Midweight Crew - Choose Your Size & Color

Package Includes: 1 - Men's 250g/m² merino wool thermal crewneck top - Black/S

CAD $86.99
Comfort Fit, Comfort Fit Men's Microfiber Fleece Lined Thermal Top & Bottom Underwear Set

Comfort Fit Men's Microfiber Fleece Lined Thermal Top & Bottom Underwear Set

92% Ultra Soft Polyester, 8% Spandex.

CAD $35.68
MEETYOO, MEETYOO Men’s Thermal Underwear Set, Sport Long Johns Base Layer for Male, Winter Gear Compression Suits for Skiing Running

MEETYOO Men’s Thermal Underwear Set, Sport Long Johns Base Layer for Male, Winter Gear Compression Suits for Skiing Running

[Excellent Flexibility For Any Movement] The men's thermal clothing is designed with four way stretch compression for your freedom of outdoor activities, never have bound feeling. Flat lock will prevent chafing and irritation of skin. 92% polyester, 8% spandex, great flexibility can keep the lasting size and shape retention.

CAD $55.99
Minus33 Merino Wool Clothing, Minus33 Merino Wool Men's Chocorua Midweight Crew

Minus33 Merino Wool Men's Chocorua Midweight Crew

100% Merino Wool

CAD $51.99
MERIWOOL, MERIWOOL Mens Base Layer 100% Merino Wool Thermal Pants

MERIWOOL Mens Base Layer 100% Merino Wool Thermal Pants

Package Includes: 1 - Men's 250g/m² merino wool thermal leggings - Black/S

CAD $86.99
Hanes, Hanes Mens Men's X-Temp Thermal Long-Sleeve Top

Hanes Mens Men's X-Temp Thermal Long-Sleeve Top

``60% Cotton, 40% Polyester``

CAD $23.08
LAPASA, Lapasa Men's 2-Pack Thermal Pants Fleece Lined Stay Warm Base Layer Bottom Long John Ski Underwear

Lapasa Men's 2-Pack Thermal Pants Fleece Lined Stay Warm Base Layer Bottom Long John Ski Underwear

Material Composition: Lightweight (160g/㎡): 90% polyester, 10% spandex; Midweight (210g/㎡): 86% polyester, 14% spandex.

CAD $129.24
Duofold, Duofold Men's Heavy Weight Double Layer Thermal Pant

Duofold Men's Heavy Weight Double Layer Thermal Pant

96% Polyester/4% Spandex Bi-polyester

CAD $52.99
 Cottonbell, Men's Classic Waffle-Knit Heavy Thermal Top

Men's Classic Waffle-Knit Heavy Thermal Top

100% Cotton

CAD $54.36
Duofold, Duofold Men's Heavy Weight Double Layer Thermal Shirt

Duofold Men's Heavy Weight Double Layer Thermal Shirt

96% Polyester/4% Spandex Bi-polyester

CAD $58.02

What's a Long Underwear ?

Long underwear, also called long johns or thermal underwear, is a style of two-piece underwear with long legs and long sleeves that is normally worn during cold weather. It is commonly worn by people under their clothes in cold countries.

In the United States, it is usually made from a cotton or cotton-polyester-blend fabric with a waffle-weave texture, although some varieties are also made from flannel, particularly the union suit, while many newer varieties are made from polyester, such as the Capilene trade name.

European manufacturers use wool blends or even 100% wool, usually Merino or other high-quality wool. Some models might include a thin layer of polyester to transport moisture away from the skin. Wool, in addition to being fire retardant, provides highly effective insulation and will keep its insulating properties even when wet, as opposed to cotton.

The type known as "thermal underwear" is made from two-ply fabric of either a wool layer and an artificial fibre, only wool or – again mostly in the U.S. – two layers of only artificial fibres, which uses trapped body heat to insulate against cold air.

Source : Long Underwear Wikipedia