Elite Racing shorts made from 100% polyester "Pro-Skin" fabric. Pro Skin helps reduce drag through the water through a tighter face of the fabrics surface. Seven SPF 50 treated flat lock stitched panels provide muscle support thus reducing muscle fatigue. New Doctor TRI Woman antimicrobial chamois has a 4 mm center density and 1.5 mm density outer area for race day comfort and performance. By moving with your body, the chamois will help reduce chafing. Both Pro Skin fabric and chamois are chlorine resistant.