Endurance®+ fabric Chlorine resistant Durable All-over Boom print The Boom All-Over Muscleback Swimsuit from Speedo features an eye-catching design to go with its ultra-practical features. The all-over Boom print adds a touch of style, while the muscleback design allows better mobility in the water. Its Endurance®+ fabric weathers chlorine for longer than the average swimsuit and better retains its shape.