ColdPruf The ColdPruf Base Layer product line has been developed for comfort and warmth in all cold weather environments, whether at home, on the job or enjoying the outdoors. CPT ColdPruf Technical Fiber, CPT, uses an innovative technology to provide superior moisture management and comfort to fabrics. This functionality is integrated into the molecular structure of the polyester fiber during its polymer stage, yielding long lasting performance as the functionality is embedded itself. The result is a proprietary fiber that delivers superior wicking and drying performance. Thermachoice System This simple system helps you choose the right base layer product for you. When it comes to staying warm, there are two factors to consider: what the weather is doing and what the body is doing. Strike a balance between the two and you’re in for a comfortable day in the out-of-doors. Thermachoice is about finding that balance. Temperature: Very Cold Extreme Cold Activity: Medium Activity High Activity Extreme Performance Men's Crew CPT Fiber Technology Two-Layer Engineering Traps Air Between Layers Providing A Natural Barrier Of Warmth Inside And Outside: 96% CPT Performance Polyester, 4% Spandex Features: Tagless Flat Seams True Sizing For Accurate Fit Self-Fabric Cuffs Extended Tail

ColdPruf Men's Extreme Performance Dual Layer Long Sleeve Crew Neck Base Layer Top