The Cross Train jockstrap is where comfort and fashion meet. Our Cross Train jock has a roomy pouch that gives great support, and the accent trim and logo waistband gives it’s sporty athletic vibe. Made of 95% Cotton and 5% Elastane. From Jack Adams. Blue, Large. Chest: 41in.-43in.. Neck: 16in.-16.5in.. Waist: 33in.-35in..