The Loverboy Trunk - Black is a men's form fitting underwear with no side seams. These comfortable trunks are perfect for wearing under tight fitting pants. It features a gusset design to lessen any 'ride', and a comfortable, non-binding waistband. There is an approximate 1 inch in-seam and closed front. Ultra soft Lenzing Modal (beechtree cellulose), cotton, elastane blend. SMALL = 27-29” waist MEDIUM = 34-33” waist LARGE = 35-37” waist X-LARGE = 39-41” waist XX-LARGE = 43-45” waist Note: if waist measurement falls in between sizing, recommend to size up (ex: 34” waist = large)