The essential compression short-can be worn underneath or on its own, the Under Armour Women's Ultra 4in Heatgear Compression Short is a must have for any activity- HeatGear® performance as a base layer or on its own. Featuring a low rise cut and lightweight power stretch fabric ensure mobility and FLATLOCK seams cut down on abrasion for long lasting comfort. 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. Ultraviolet protection protects your skin from the sun's harmful rays and inhibits premature aging.