Russell Athletic Men's Coolcore Compression Tight 84% polyester/16% spandex elastane Xtreme compression cloth with Coolcore® technology. 92% polyester/8% elastane stretch mesh insert at back of knee and gusset. 4-way stretch properties allow for increased mobility. Coolcore® is engineered to distribute moisture quickly throughout the garment. As the moisture spreads it will dry faster and keep you cool and comfortable. Garment protects against the sun with 50+ UPF. Wicks moisture. Ultra tight fit. Tagless label. Branded soft brushed back exposed elastic waistband provides comfort.