Perfect Fit Brand Jock Armour Extra Large Black. Jock Armour is hybrid gear that defies categorization. The Jock Strap features a contoured body fit cock ring that fits your anatomy like a second skin. The heart of the jock is the cock ring which is an integrated part of the jockstrap. Jock Armour delivers with all day comfort and features a perineum bulb at the base for extra pleasure. Jock Armour also features etched details which add to the sexy look of the jock. Extra Large fits men with 37 inches to 39 inches waist.