Boom Allover Muscleback SwimsuitStyle and sport meet with this Speedo Boom Allover Muscleback swimsuit featuring Speedo's signature Boom print. In a 4-way stretch fabric with muscleback design, this suit gives you flexibility and freedom of movement. The Endurance10 fabric is 100% chlorine resistant so this suit will last longer and the CREORA HighClo means it will fit like new for longer too.