The 2XU MEN'S COMPRESSION TRI SINGLET utilizes 2XU's powerful 70D/CK fabric which is a compression technology that enhances 70D Lycra, it offers impressive strength to increase endurance by containing the muscles to reduce fatigue. High filament, moisture wicking nylon yarn keep you dry during transition . Also in this singlet is the Ice-X fabric which uses Xylitol and IR blocking. Xylitol is embedded in the yarn of the fabric to draw heat away from the body and IR blocking inhibits penetration of infrared rays to lower skin temperature by up to 5.4 degrees. The application of Ice-X to polyester/elastic delivers heightened moisture management while high filament yarns and a higher gauge knit are utilized for a lighter, breathable fabric. This singlet also comes equipped with a rear pocket, perfect for storing nutrition packets for an extra energy boost during your competition.