High-quality, FINA-approved racing swim cap combines performance with comfort and is ideal for both competitive and fitness swimmers looking for a perfect fit Hydrodynamic racing swim cap provides an adaptive, tight fit with no wrinkles and no water drag, for uniform compression and top hydrodynamics so you can gain advantage over your competition Made of long-lasting, extremely thin silicone with a sticky polish on the inside that keeps the swimming cap secure on the head, ensuring a second skin feeling and a stable fit 3D molding gives the swimming cap its ergonomic properties and eliminates wrinkles, making for a smooth glide through the water; PVC-free and wrinkle-free Elastic and smooth silicone makes it easy to put on, and provides increased flexibility and comfort while also protecting the hair from chlorine; Please note, swim caps don’t provide a watertight seal