Named one of "Men's Health" Top 10 Athletic Underwear. The Jack Adams Trainer Trunk combines the athletic support of a jockstrap with the comfort and coverage of traditional underwear. It's ideal for playing sports and other strenuous activities, because of the anatomical support provided by its full front pouch. This trunk also features a fully functional fly. Plus, the body-hugging cut keeps it from riding up the thigh while being active. With super soft fabric, this comfortable trunk can easily be worn all day long too. Made from 90% Cotton and 10% Elastane. From Jack Adams. Surf Blue, Medium. Chest: 38"-40". Neck: 15"-15.5". Waist: 30"-32".