Speedo HB Place Muscle Back Swimsuit Ladies This Speedo HB Place Muscle Back Swimsuit will help you find your lane. Crafted with a polyester material in a regular fit, this piece features Eco Endurance fabric which is quick-drying, durable and 100% chlorine resistant making it perfect for regular training sessions. Finished with the Speedo branding at the centre of the chest for an athletic styling.