ScentLok ClimaFleece BaseSlayers Long-Sleeve Top for Men takes intelligent designs, fabrics, and technologies to deliver the only base layer you'll need in your arsenal. A smooth, lightweight outer fabric is great for layering when the temps drop, while the micro-fleece lining offers enough warmth that you could wear it alone on warmer days. Along with the perfect weight and warmth, this ScentLok base-layer top brings an unprecedented triple threat of scent-reducing technologies that adsorb odors and prevent odor-causing bacteria to give you the best protection available. The flat, narrow collar provides great layering, and a rear stretch panel moves when you do for greater mobility. Flat-lock seams provide next-to-skin comfort. 100% polyester Smooth face fabric: great for layering Micro-fleece lining: warm and soft Carbon Alloy technology for advanced odor adsorption Silver Alloy to inhibit the growth of bacteria Fusix technology helps to reduce bacteria and odor while staying stretchy Moisture-wicking Flat, narrow collar Rear stretch panel Flat-lock seams Helps reduce odors; does not guarantee 100% odor elimination