Solid-color silicone swim cap Silicone allows head to breathe for a more comfortable fit Designed to securely hug the head to reduce drag Can be stretched to more than double its original size Lightweight and durable cap that is designed to hold dome shape and rounded fit with no wrinkles, which reduces drag. The silicone allows the head to breath for a more comfortable fit and can be stretched to over double its original size. Quick and easy to take on and off while not snagging hair.