MB Neon Trunks Yellow Medium from Male Basics Underwear. This ventilated neon trunks provide comfortable air flow and a bold contour pouch. Made of knit Polyester and Spandex. Wide elastic waist band with bold Male Basics logo fixed at center front. Opaque unlined contour pouch in contrasting color. Ventilated mesh body. Contrast flat lock seam along rear center for a defined fit. Contrast taping along leg openings with encased elastic for a custom fit. Covered elastic waist band is 2 inches wide. Contour pouch. Fabric blend 78% Nylon, 22% Spandex. Care: Machine wash cold. Use only non-chlorine bleach. Tumble dry low. Iron warm as needed. Medium waist 33-35 inches. What size to get: 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. Men size medium 33 inches to 35 inches.