Ships from Hong Kong. This silicone swim cap is lightweight and durable, designed to fit swimmers with big head. The silicone allows the head to breath for a more comfortable fit and can be stretched to over double of its original size. It is environmental and waterproof. Silicone allows the head to breath for a more comfortable fit. Quick and easy to take off without snagging hair. Resistant to snagging and tearing. Designed to fit snugly onto the user's head to avoid folds and consequent drag in the water. Can be stretched to more than double its original size.