The Diamond MMA Quad Strap Jock with Cup Pocket is a groin protector designed for high impact sport athletes. Made from the best materials available, the Quad Strap Jock System is a unique system specially designed to hold the jock cup firmly in place. The jock works with the Diamond MMA Cup which is sold separately. The cup incorporates a co-molded elastomer design coupled with a polycarbonate core to provide uncompromising comfort and protection for the athlete. Sizing Waist in Inches Small 28"" - 32"" (71-81cm) Medium 32"" - 34"" (71-86cm) Large 34"" - 36"" (86-91cm) X Large 36"" - 40"" (91-101cm) XX Large 40"" - 44"" (101-112cm) Your Diamonds are made to fit tight but comfortable. If you are thicker in the thighs and/or seat, go up a size. The product comes in a combination of black and blue colors.