100% BIZ COOL Cotton-feel Micro Polyester 160 GSM UPF rating – Good. Features no-fuss anti-shrink, anti-fade fabric has a cotton-like feel that keeps you cool and dry. Heathered marle pattern adds a subtle point of difference. Flat-locked shoulder seams for mobile comfort. Neatly designed self-fabric collar & placket. Mens style includes loose pocket.