Enhancing your comfort in the water thanks to the integral support and 4-way stretch fabric, the Speedo Hyper Boom Splice Jammer is a great choice for daily swimming and fitness training. Cut for performance, these swimming jammers keep you streamlined in the water with a drawstring waist ensuring a secure fit. Endurance + - Designed to last longer Endurance + uses a blend of PBT and polyester fibres which help to provide high chlorine resistance. Longer lasting fit through wear and use and resists snagging and fading for longer than other swim fabrics. Featuring multi-directional stretch fabric for added softness and comfort and provides UVA and UVB protection from the sun.