A. Warmth Protection: Our 3mm neoprene diving hood can keep your head warm and comfortable, prevent rashes, and offer protection. You can enjoy nice moments without much worry. Also, this swim cap can keep your head warm when you're paddleboarding in cool water. It fits well and dries relatively quickly, being suitable for various water sports. B. Sun Protection: This diving cap has good UV protection, shielding you from harmful sunlight during water activities. It can also protect your head from sea lice, jellyfish, coral, etc. C. Adjustable Design: The swim cap comes with an adjustable chin strap and a double - locking mechanism of hook and loop fasteners, ensuring that the hook and loop of the chin strap are fixed firmly. This adjustable diving cap can fit most sizes and is suitable for both men and women. Moreover, it's easy to open, making it convenient to put on and take off quickly. D. All - round Protection: Whether you're surfing, diving, swimming in open water, scuba diving, water skiing, canoeing, kayaking, doing board sports, or sailing, this neoprene diving hood can ensure that your head is well protected from cold winds, cold water, jellyfish, or sharp rocks.