Classic sports styling, straight from the Speedo design archives. This sporty HyperBoom Jammer nods to our brand heritage with a revival of our iconic go-faster Boom Logo stripe. It's cut with a front support liner and an adjustable drawstring for comfort and security during training. Be ready to go again in the quick-drying Endurance+ fabric, designed for durability with high chlorine resistance. Body made of 53% Polyester, 47% PBT. Endurance+ Fabric: Body made of 53% Polyester, 47% PBT. Drawstring waist for enhanced fit and security Front Liner made from Polyester.