Material: Outside: 4-way-stretch,good elasticity,100%Polyester. Inside: 90%Polyester+10%Spandex, comfortable and lightweight fabric, breathable and quick dry fabric to keep you comfortable for workout and exercise. Athletic Mens Swim Trunks: 5" Inseam Compression Lined Trunks,not only for swimming, you can also wear it for exercising, running, workout.Two side pockets and one back pocket and one inner compression shorts pocket, it can storage small things like phone, keys, cards, pedometer. Upgraded Swimming Shorts: 2 in 1 designed with lightweight outer layer and breathable lining,Compression shorts support the private protection, reduce the risk of bruising and protect your legs during activities.There are still water repellent and UV protection will enhance your wearing experience. Elastic Waistband: Featured elastic can perfectly suit your waist,which you can make personalized fit, easy to adjust and firm support. Ideal for a Wide Variety of Occasion: QRANSS New Board Shorts Compression liner fits for indoor and outdoor, FITNESS, TRAINING, RUNNING, SWIMMING,and other training activities.