84% polyester/16% elastane Xtreme compression cloth with Coolcore fabric technology 92 polyester/8% elastane stretch mesh inserts on center back and underarm Coolcore fabric is engineered to distribute moisture quickly throughout the garment. As the moisture spreads it will dry faster and keep you cool and comfortable. 4-way stretch properties allow for increased mobility, Garment protects against the sun with 50+ UPF Wicks moisture, Tagless label, Crew neck, Raglan sleeves, Dropped tail