KLIM Men's Covert Balaclava DryTech The Covert Balaclava features a Coolmax&#174; breathable moisture-wicking fabric on top and sides of the head, dual-zone Windstopper&#174; fabric, stretch fabric backing to fit different head sizes and shapes, and elastic side panels which provide additio Windstopper&#174; fabric. Coolmax&#174; breathable moisture-wicking fabric at top / side of head. Backed with stretch fabric to fit different head sizes / shapes. Ergonomic patterning.