You've been training for months ''' maybe even years ''' so you want to find every advantage you can during your next triathlon. Anything you can do to move more efficiently matters, and wearing the 2XU Perform Men's Compression Tri Singlet is almost like cheating. It combines 105DCK, SBR Lite, and Sensor Mesh fabrics to support your core, increase blood flow, and reduce lactic acid build up, helping you go faster and feel fresher, which matters when you're at the start or two miles from the finish line. The shoulder and back panels are also perforated to help you stay cool, and the Perform's active cooling can help lower skin temperature by up to five degrees, a significant difference when small margins separate you from the competition. In addition to offering compression and support, the Perform's fabric is constructed to be antimicrobial and wick moisture, and UPF 50 sun protection helps prevent sunburn during events. All the seams are built with flatlock stitching, which sits comfortably against your skin to prevent chafing, and the semi locking front zipper offers additional ventilation. Three rear pockets finish the Perform's construction with their bottle carrying, snack holding capacity.