The ZONE3 Neoprene Heat-Tech Warmth Swim Cap offers fleece-lined insulation while maintaining optimal hydrodynamics through the water. This 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.