Fastskin HyperSpark: Your journey to unstoppable starts here. Take your race day performance to the next level wearing the new Fastskin HyperSpark Openback Kneeskin. Our newest Fastskin race suit is designed for speed and comfort, featuring a flexible knitted fabric and flatlock seams. Sewn dual-layer inner panels provide low-level compression at the core and legs so that you can conquer the competition in style and comfort. Flexible, low-profile comfort straps and an open back allow whole arm and shoulder mobility, ensuring nothing holds you back on your path to the podium. World Aquatics has fully approved this product.