2XU Men's Perform Tri Singlet Shirt 83% POLYAMIDE, 17% ELASTANE Imported Quick-drying SBR Lite fabric helps you stay cool and comfortable during your ride and run Sensor Mesh X ventilated panels bring fresh air in and keep sweat out Flatlock stitching enhances comfort, eliminating chafing and irritation Three convenient rear angled pockets are perfect for storing fuel 50+ UV fabric provides extra protection against harmful rays