Speedo Endurance Plus Boy's Jammer - Size 24 to 30 Great for swimming lessons or fun at the pool. This jammer is comfortable and offers a drawstring waist for a secure, confident fit. Made from our Endurance? + fabric, resisting chlorine and fading longer than other swim materials. Features Drawstring waist for a secure fit 100% chlorine resistant, so your swimwear wont degrade in the swimming pool. Freedom to move 4 way stretch technology for comfort and softness. Endurance+ fabric retains its shape and resists fading longer than any other swim material.