Designed for junior training. lessons. and active swims. the Hyperboom Splice Muscleback swimsuit is part of our iconic Hyperboom collection. Made from Endurance Pro fabric for active comfort and durability. it resists chlorine and pilling while delivering flexible four-way stretch. The design includes classic coverage and muscleback straps. allowing flexibility and freedom of movement. Body made of 57% polyester. 43% polyester PBT.