Developed by swimmers for swimmers, with a long-lasting water-repellent coating engineered from Lamoral® Space Tech, the Fastskin LZR Pure Valor 2.0 Openback Kneeskin includes a Compressive inner leg Seam for better muscle support. Feel light, flexible and fast - made from lightweight fabric and constructed with Moderate Compression 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 World Aquatics.