Speedo Essentials - everything you need for a great swim. Take on your training wearing the sleek navy Dive Thinstrap Muscleback featuring an eye-catching blue and orange colourblock side panel and contrasting blue trim neckline. A great choice for your workout, the muscleback design with thin straps offers flexibility and freedom of movement. Offering higher chlorine resistance than standard swimwear fabrics, our shape-retaining Endurance10 fabric fits like new for longer with CREORA HighClo .