Description The Zephyr features ColdPrufA(R) Technical Fiber Polyester with SILVADUR(TM). Intelligent freshness, a mini-waffle knit, and mesh inserts that provide excellent moisture management properties for warmth, and long-lasting odor control on the fabric. The Zephyr is an active wear piece, as well as a base layer. Flat lock seams, drop tail crew. For cold to very cold weather conditions.image