Stay comfortable—and stay longer—in cold open water with the HUUB Neoprene Skull Cap. Engineered for serious swimmers and triathletes, this 3mm high-grade neoprene swim hat provides reliable warmth around your head and ears, transforming your experience in chilly lakes, rivers, and race starts. A fully adjustable chin strap keeps the cap snug and secure through hard intervals or long-distance sessions, and its stretchy construction molds to your head’s contour for comfort with every stroke. The streamlined shape fits easily under wetsuit hoods and works great with goggle straps, making it the top pick for endurance athletes who want extra warmth without distraction or slippage. Whether you’re acclimatizing to colder water, extending your outdoor swim season, or racing with confidence, the HUUB Neoprene Skull Cap is essential kit for thermal protection and comfort. Key Benefits: * 3mm premium neoprene for excellent insulation * Fully adjustable, soft chin strap eliminates slippage * Lightweight and low-profile for race and training versatility * Multiple sizes for a custom fit (see Size Guide) * Designed to work under wetsuit hoods or with goggles * Folds flat for easy transport in any swim bag Ideal for open water swimming, wild swimming, triathlon, or any adventure where cold water can hold you back. Size Guide: Size Head Circumference (cm) Head Circumference (inches) S <55 <21.5" M 55–59 21.5"–23" L >59 >23"