Under Armour Men's UA Freedom Navy Compression Shirt Compression: Ultra-tight, second skin fit. Smooth, chafe-free flatlock seam construction. HeatGear fabric is ultra-soft & smooth for extreme comfort with very little weight. 4-way stretch fabrication allows greater mobility in any direction. UPF 30+ protects your skin from the sun's harmful rays. Moisture Transport System wicks sweat & dries fast.Anti-odor technology prevents the growth of odor causing microbes.