CW-X technology takes athletic wear to a whole new level of performance. Like a race car whose parts and pieces are totally aligned, a body in CW-X is molded into a single efficient force. CW-X garments are made of high-tech, four-way stretch fabric. Comprised of DuPont performance materials, CW-X styles keep athletes feeling cool,, dry and comfortable throughout the toughest workout. They also provide "excellent" sun protection -- rated UPF 40-50+.