From website: https://www.underarmour.com/en-gl/rock-vanish-legging/pid1321411 Product DNA Compression: Ultra-tight, second-skin fit for a locked-in feel. UA Microthread technology in the fabric dries faster, won’t cling to you, won’t chafe & stretches without absorbing sweat Ergonomic design keeps seams off high abrasion areas & increases durability 4-way stretch construction moves better in very direction Material wicks sweat & dries really fast