The 2XU Compression Short is designed to support this key area of the body throughout training and on race day... Suitable for wear under competition uniforms, 2XU has engineered the fit of this Short to provide equal support to all regions of the upper leg - a particularly high stress and often injury stricken area... HIGH GAUGE DENIER: 2XU Compression features 50 denier LYCRA® fibre while our competitors use 30/40 denier... Denier represents the thickness of the yarn. A thicker yarn delivers a stronger compressive power... CIRCULAR KNIT: 2XU Compression garments are the only multipurpose compression garments constructed using a circular high gauge knit structure... This structure delivers an evenly distributed 360 degree stretch compression not achievable in garments with a traditional tricot knit...