The 2XU XFORM Compression Running Tights support your muscles, so they're less fatigued as you run. Compression improves circulation to your muscles, providing more energy during activity and reducing soreness after activity. The 2XU XFORM Tights are made with breathable, moisture-managing fabric so sweat won't build up. An anti-microbial treatment resists odor buildup, and since these tights fit so close, 2XU used flatlock seams that won't irritate the skin.