Product Details Sizing Guide HeatGear®For when it's hot. Keeping athletes cool, dry, and light. Ideal use: Extremely warm weather. Over a decade ago, HeatGear®, the original second skin layer, sparked the revolution of performance apparel and rendered cotton T-shirts obsolete. Odor ControlControls odor by Preventing the growth of odor causing microbes. Strategic VentilationStrategic venting built into garment at key points where body dumps heat. Keeps athlete cool in extreme heat. Lightweight HeatGear® fabrics. Built with Flatlock Seams that feel smooth against the skin and prevent chafing. Superior HeatGear® moisture transport keeps you cool and dry. Articulated mesh crotch for comfort, ventilation, and support. Strategic vent zones built into key points where the body dumps heat, keeping you cool, dry, and comfortable. Anti-Odor Technology prevents the growth of odor causing microbes. 6-inch inseam. 90% Polyester/ 10% Elastane. FITTED - A specialized fit that's not tight, but designed to be very close to the body without the constriction of compression.