Reebok 3 Pack Boxer Shorts. Made with flat-lock seams to reduce chafing, these trunks then come with a reinforced breathable, meshed crotch gusset for added comfort and an elasticated waistline that comes with branding across the elasticated waist band for a prominent designer effect. Perform at your best with the Reebok Men’s Performance 3-Pack Long Sports Boxer Trunks, made from 92% polyester and 8% elastane for a supportive, flexible fit. Featuring moisture-wicking technology to keep you cool and dry, a longer leg design for added coverage, and a soft brushed nylon branded waistband for all-day comfort and style.