The Essential Compression Short just got better. This key compression piece is Flatlock-seamed and fully-reinforced to provide comfort and durability, while HeatGear fabric keeps you cool and dry. For when it's hot. Keeping athletes cool, dry, and light. Ideal use: Extremely warm weather. Over a decade ago, HeatGearŪ, the original second skin layer, sparked the revolution of performance apparel and rendered cotton T-shirts obsolete. Also features UA Odor Control that prevents the growth of odor causing microbes and UPF Ultraviolet protection protects your skin from the sun's harmful rays and inhibits premature aging.