Adjustable sizing S-XXL for US Men's clothing size. DURABLE & COMFORTABLE: Well made of 900D high density nylon,well constructed, strong tensile wear-resisting ability. ADJUSTABLE S-XXL: maximum chest size is 50 inches. be adjusted to fit max be adjusted to fit shoulder and waist size. Carry 3 standard magazine pouches ,1 map and flashlight pouch, 2 communication pouches and 1 medic pouch,all bags are removable.