Great for both training and competition, The CW-X Ventilator Web Tri-Top is designed to enhance performance during the extreme stresses associated with long marathons and triathlons. This Tri-Top utilizes CW-X Support Web technology which supports the trapezius muscles and the scapular bones in your upper back. This Web Technology improves running posture and supports proper arm and shoulder form. Air ventilation is no problem thanks to the mesh ventilation pannels which reduce heat fatigue while increasing circulation. The fabric is complete with 50+ UV protection and Antibactieral fiber.