The Columbia Boys Backcast Swim Shorts keep him comfortable from the lake to the beach. These quick-drying swim trunks boast an elastic waist, an interior mesh brief, and hand pockets. Omni-Shade UPF 50 works alongside sunscreen to protect from damaging UV rays. The Columbia Backcast Swim Shorts for boys have a 5 inseam. Shell: Textured 100% nylon poplin. Lining: 100% polyester mesh. Machine wash. Imported. Inseam: 5. Size: XXS. Color: Vivid Blue. Type: Shorts.