The Under Armour Men's UA Heatgear Full Compression Tee. Your best Tee, just got better. The shirt that started it all updated with a new ergonomic fit and the Anti-Odor HeatGear® fabric moisture transport ensures fast drying performance that keeps you cool and won't weight you down. Delivered in UA's signature compression fit for bolstered muscle support and increased circulation resulting in higher efficiency output and increased stamina. 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. Controls odor by Preventing the growth of odor causing microbes. Ultraviolet protection protects your skin from the sun's harmful rays and inhibits premature aging.