Feel unstoppable wearing Speedo\'s latest innovation developed by swimmers for swimmers. The Fastskin LZR Pure Valor \'Sonic Stealth\' Openback Kneeskin is made from lightweight material and features moderate compression and construction designed to support a greater range of movement. Dual layering around the abs offers greater core stability so you get the best out of your swim. The open back offers freedom of movement and may be preferred by swimmers with arched backs. This product has been fully approved by FINA.