2XU Unisex Compression Tights the performance of this tight comes down to two important factors the performance of the fabric and the graduated compression fit. Utilizing the 2XU exclusive 50D/CK fabric 2XU has combined a 50 denier Lycra together with a revolutionary circular knit high gauge construction, which provides the most compressive fabric on the market. The graduated compression of the tight is fundamental to remove all the waste byproducts that the body produces during high active sport, which cause fatigue. The extra push of blood from the ankles towards the heart allow this tight to give you another level of performance and will allow you to perform longer with less fatigue. It is important after Triathlon workout, and race day to speed up the recovery process.