Fastskin HyperSpark: Your journey to unstoppable starts here Take your race day performance to the next level wearing the Fastskin HyperSpark Jammer. Our Fastskin jammer is designed for speed and comfort with flexible knitted fabric and flatlock seams. Sewn dual-layer inner panels provide low-level compression at the core and legs, so you can conquer the competition in style and comfort. The soft waistband includes a soft gripper for comfort and a secure fit, ensuring nothing holds you back on your path to the podium. This product has been fully approved by World Aquatics.