Zappos.com is proud to offer the CW-X - Short-Sleeve Ventilator Web Top (Black) - Apparel: The lightweight, breathable, and highly technical Ventilator Web Top has your back when it comes to performance and support as you run. ; CW-X's Support Web design targets the trapezius muscles and scapular bones to support proper form and more controlled shoulder and arm movement. ; Quick-drying fabric wicks away moisture for maximum comfort on the go. ; Healtha+ four-way stretch mesh provides full mobility and increased ventilation. ; Silver fiber nanotechnology repels odor. ; UPF 50+ titanium oxide fiber UV protection. ; CW-X logo at left chest. ; Body: 90% polyester, 10% spandex. ; Support panel: 80% nylon, 20% Lycra. ; Machine wash warm and line dry.