Alpinestars Winter Tech Performance Suit Alpinestars Winter Tech Performance suit is part of Alpinestars range of base layer underwear developed for providing core temperature regulation. Dual density layers provide extra moisture wicking to keep the body comfortable. Features One piece suit with a hidden front zip closure offers full coverage warmth with a minimal number of seams. Developed for cold weather riding conditions with double density fabric covering the most exposed areas. Comfortable moisture wicking material for optimal thermal protection. Made from polypropylene with elastine fabric that will not melt under abrasion. Tubular, seamless construction. Compression fit for muscle support to reduce fatigue. Hypoallergenic and bacteriostatic fabric.