Anyone who has experienced ‘brain-freeze’ when swimming in cold water will know how valuable triathlon skull caps can be to get you going! Our Neoprene Heat-Tech Warmth Swim Cap offers fleece-lined insulation while maintaining optimal hydrodynamics through the water. We have found the biggest complaint from swimmers who use one-piece caps is that they can feel ‘tight’ under the chin and have no adjustability. Our design is focused on making this cap the best fit possible, with a Velcro strap under the chin to cater for different head sizes. Key Features: Heat-tech lining for increased thermal properties Velcro strap under chin. High quality 4mm Yamamoto Smoothskin material. Part of a neoprene accessory range designed for year round training. Key Benefits: Accommodates a wide variety of head sizes. Increased warmth for your coldest open water swims. Low drag hydrodynamic design Neoprene Swim Caps Size Chart Size Head Circumference S < 21in M 21in - 22in L 22in + Size Head Circumference     S < 55cm    M 55cm - 57cm     L 57cm +