Burton Haven Sherpa Flannel Highly breathable and ultra fast-wicking, DRYRIDE Ultrawick fabrics use microscopic fibers that pull heat-robbing moisture vapors away from your skin before they sour your pickle. Quick-Drying and Breathable, built with fabrics that draw heat-robbing moisture away from your skin before your freeze solid. Highly breathable, quick-drying, and warm, DRYRIDE Thermex fleece provides core insulation while transporting heat-robbing moisture away from your First Layer to keep you dry from the inside out.