Feel unstoppable wearing Speedo\'s latest innovation developed by swimmers for swimmers. The Fastskin LZR Pure Intent \'Sonic Stealth\' Openback Kneeskin features compressive dual layers and ergonomic seam construction designed to connect key muscle groups for greater power return. Textured fabric zones target drag reduction so you get the very best from your swim, and the triple fabric construction with bonded seams has been designed to enable greater movement. The open back offers greater freedom of movement and may be preferred by swimmers with arched backs. This product has been fully approved by FINA.