Male Basic DNGEON Peekaboo Jockstrap O/S Hanging from Male Basics. Complete with a decorative ring in the back side and snap beadss plus adjustable metal connectors. This style boasts a soft microfiber construction with an elastic finish. Metal rings add that sexy finishing touch. Jock strap features an open back. SKU DMBL04-Black-OS. Color Filter Black. Color Black. Material Faux Leather Jockstrap, Metal rings. Brand DNGEON. Take a measurement tape and your posture should be nice and straight, without holding in or sticking out your stomach, Locate the bones on the right and left side of the abdomen. For Male Basics Underwear measure approximately 5 Inches under the belly button. Now locate the range between any of the values on the table and that would be your size. One size fits men with 30 inches to 36 inches waist.