Called a "Killer Value" in the Winter Outside Magazine Buyer’s Guide, warmth and layering performance is what the Terramar Ecolator is all about. The high loft grid channels create an ideal microclimate that efficiently traps air and effectively allows circulation. Versatile enough to be worn as an outer or inner layer the Ecolator Men's Pant with Fly is the perfect pant for all your cold weather endeavors into the mountains or woods.Features Engineered to adjust to your body temperature Inhibits the growth of bacteria that causes odor Fast wicking and drying High grid fleece for warmth and breathability in cold conditions 4-way stretch Heavyweight (3.0) perfect for cold weather activties UPF Rating 50+ Functional thumbholes and all flat seam construction 95% Micro-Polyester, 5% Spandex