Under Armour Combine Short Sleeve Compression T-Shirt HeatGear moisture transport ensures fast drying performance that keeps you cool and won't weight you down. Compression fit - for zero distractions while you train, regulating your muscles and aiding recovery. Flatlock Seams - reduce any rubbing or chaffing that regular seams can cause meaning a more comfortable fit all round Odor Control - Controls odor by Preventing the growth of odor causing microbes.