Justin + Simon Classic Bikini Wine Large from Male Basics Underwear line. More information: Male Basics SKU XSJ01. Colors Red, Purple, Pink, Green, Blue, Black, Wine. Material fabric Content: Nylon 78%, Spandex 22%. Brand Justin + Simon. How to find your size: 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 Malebasics 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. Waist sizes large 36 inches to 38 inches.