Speedo Essentials – everything you need for a great swim.Speedo Essentials – everything you need for a great swim. Take on your training wearing the funky Dive Thinstrap Muscleback from our much-loved Speedo Essentials range. Featuring an eye-catching dual-tone colourblock splice with printed panel, the muscleback design with thin straps offers flexibility and freedom of movement. Our Endurance10 fabric contains Creora HighClo, ensuring your suit will fit like new for longer. Soft and stretchy, so you can enjoy your swim without feeling restricted.