HAZARD 4 Skin Diver(TM) ID Neoprene Shirt by (R) Velcro panels on arms for modular patches; Velcro panels on chest for name tape & larger patches. Stealthy, unobtrusive Hazard 4 logo for uniform use; Greatly reduces chafing from equipment/environment. Front hem loop (tie into swim trunk string to prevent rising); Elastic loop at the thumbs to keep the sleeves from rising up. Total blind-stitching for flat seams and no chafing; Ribs + inner-arms super-stretch neoprene for comfort. Sizes: S/M/L/XL/2XL; Main Material: 2mm rubbery-neoprene chest, 1.5mm neoprene abdomen/back/arms.