Speedo Essentials - everything you need for a great swim. Speedo Essentials - everything you need for a great swim. Take on your training wearing the Endurance+ Thinstrap swimsuit from our much-loved Speedo Essentials range. Stylish in bright red, a wide open back and thin straps allow unrestricted shoulder movement for comfort during training. 100% chlorine-resistant, our Endurance+ fabric is perfect for regular sessions in the pool. Features & Benefits - Secure Fit - internal drawcord allows you to adjust the fit - Front Lining - provides added comfort and modesty - 100% Chlorine resistance - for long lasting performance - Quick Dry - dries faster after your swim workout - Endurance + - 100% Polyester