| Warm Thermal underwear is essential to your comfort in cold weather. Nothing will keep you warmer in winter or cold weather than the right thermal base layer next to your skin. Cotton or Polypro long underwear traps heat from your body forming a layer of warmth next to your skin. To maximize your warmth, you need the right thermal underwear fabric for your environment and level of activity. Polypropylene is a great synthetic thermal underwear fabric for high aerobic activity in cold weather. When you sweat, you want the perspiration to be pulled or wicked away from the skin by your thermal underwear and then dried as quickly as possible. Polypropylene thermal underwear does just that. It also retains its warmth even when it gets wet. If you prefer all natural thermal fabrics next to your skin then 100% merino wool is what you want. Merino wool is very soft, unlike regular wool. It has all of the same great insulating features of regular wool. You will pay more for merino wool thermal underwear, but you definitley get what you pay for in comfort, performance and quality. For extremely cold temperatures, you want our thicker cotton thermals or our fleece polypropylene underwear. All of our thermal underwear and winter clothing products are available year round! | ||
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Thermal Underwear![]() Black Heavy Weight Fleece Polypropylene UnderwearTHESE ARE OUR WARMEST THERMALS! These are not the best looking or highest quality thermal underwear, but they are sure to keep you warm. Military... $20.95 ... more info ![]() Desert Sand 2 Layer Polypropylene Long UnderwearThese are Genuine U.S. Military Issue Polypropylene Thermals, a vital part of the Extended Cold Weather Clothing System(ECWCS). Heavy weight polypro... $20.95 ... more info ![]() Men's Coldpruf Merino Wool Blend Thermal PantPERFORMANCE THERMAL UNDERWEAR FOR: TEMPERATURE: VERY COLD TO EXTREME COLD / ACTIVITY: LOW TO MEDIUM The Authentic base layer thermal is a cozy 2... $24.99 ... more info ![]() Men's Coldpruf Merino Wool Blend Thermal TopPERFORMANCE THERMAL UNDERWEAR FOR: TEMPERATURE: VERY COLD TO EXTREME COLD / ACTIVITY: LOW TO MEDIUM The Authentic base layer thermal is a cozy 2... $24.99 ... more info ![]() Mens Coldpruf Platinum Merino Wool Polyester Blend Pant, GreyTEMPERATURE: COLD TO EXTREME COLD / ACTIVITY: MEDIUM TO HIGH The mens Platinum series thermal underwear from Coldpruf is designed for maximum comfort... $22.95 ... more info ![]() Mens Coldpruf Platinum Merino Wool Polyester Blend Top, GreyTEMPERATURE: COLD TO EXTREME COLD / ACTIVITY: MEDIUM TO HIGH The mens Platinum Thermal Underwear series from Coldpruf is designed for maximum cold... $22.95 ... more info ![]() Mens Coldpruf Platinum Merino Wool Polyester Blend Pant, BlackTEMPERATURE: COLD TO EXTREME COLD / ACTIVITY: MEDIUM TO HIGH The mens Platinum series thermal underwear from Coldpruf is designed for maximum comfort... $22.95 ... more info ![]() Mens Coldpruf Platinum Merino Wool Polyester Blend Top, BlackTEMPERATURE: COLD TO EXTREME COLD / ACTIVITY: MEDIUM TO HIGH The mens Platinum Thermal Underwear series from Coldpruf is designed for maximum cold... $22.95 ... more info ![]() Men's Coldpruf Basic Base Layer PantTEMPERATURE: COLD TO VERY COLD / ACTIVITY: LOW TO MEDIUM Our Men's basic baselayer thermal underwear is one of our softest thermals. The ribbed... $14.99 ... more info ![]() Men's Coldpruf Basic Base Layer Thermal TopTEMPERATURE: COLD TO VERY COLD / ACTIVITY: LOW TO MEDIUM Our Men's basic baselayer thermal underwear is one of our softest thermals. You'll love the... $14.99 ... more info ![]() Men's Coldpruf Extreme Performance Expedition Weight Mock Zip TopBEST FOR EXTREME COLD-The EXTREME PERFORMANCE base layer thermal is constructed with 2 layers of CPT – COLDPRUF® TECHNICAL Fibers for WARMTH, MAXIMUM... $43.95 ... more info ![]() Men's Coldpruf Extreme Performance Expedition Weight PantBEST FOR EXTREME COLD-The EXTREME PERFORMANCE base layer thermal is constructed with 2 layers of CPT – COLDPRUF® TECHNICAL Fibers for WARMTH, MAXIMUM... $38.99 ... more info ![]() Men's Coldpruf Extreme Performance Expedition Weight TopBEST FOR EXTREME COLD-Our Exreme Performance base layer thermal underwear is constructed with 2 layers of CPT – COLDPRUF® TECHNICAL Fibers for... $38.99 ... more info ![]() Men's Expedition Weight 100% Merino Wool Thermal TopTHESE ARE OUR WARMEST WOOL THERMALS. Merino wool has in the last few years become the first choice of all avid outdoor enthusiasts for moisture and... $79.99 ... more info ![]() Men's Expedition Weight 100% Merino Wool Underwear PantTHESE ARE OUR WARMEST WOOL THERMALS. Merino wool has quickly become the choice of all avid outdoor enthusiasts. Merino wool thermal underwear is... $79.99 ... more info ![]() Men's Mid Weight 100% Merino Wool Thermal TopMerino wool has in the last few years become the first choice of all avid outdoor enthusiasts for moisture and temperature management. Merino wool... $59.99 ... more info ![]() Men's Mid Weight 100% Merino Wool Underwear PantMerino wool has quickly become the choice of all avid outdoor enthusiasts. Merino wool thermal underwear is super soft and does not itch like... $59.99 ... more info ![]() Mens Coldpruf Single Layer 100% Polypropylene Crew Neck TopThe ENTHUSIAST is a single layer garment made of 100% Polypropylene. This design will give you a close, comfortable fit without restriction. The... $17.99 ... more info |





















