The Gul Petrel 7 Seas Cap features Revofit 3D molded technology, to create the optimum fit and comfort cap, that gives outstanding hydrodynamic performance. The Petrel 7 Seas cap uses 96g + silicone which is double the weight of the average 2D 48g swimming cap, that helps to reduce heat loss from your head so you can stay comfortable in the water for longer. Key features > easy to use, comfy and streamlined to deliver you ultimate performance. > 100% 3D silicone > Glow colour option features ‘Firefly’ Technology which allows the cap to glow in low light conditions and is a great safety feature for open water swimming. > can be worn under the Gul neoprene skull cap for additional warmth. Keeping your head warm, so you can swim longer, the Gul Petrel 7 Seas Swim Cap is ready to make a splash in the open water. Thicker than your regular swimming cap, and featuring Revofit 3D-moulded technology for optimum fit and comfort, it gives outstanding hydrodynamic performance to help reduce heat loss from your head. Team it up with the Gul Neoprene Swim Cap and you’re well wrapped up for facing the cold British waters all year round. Key features • white colour option features ‘Firefly’ Technology which allows the cap to glow in low light conditions - a great safety feature for open water swimming • available in black and white colours • easy to use, comfy and streamlined to deliver you ultimate performance. • 100% 3D silicone • can be worn under the Gul Neoprene Skull Cap for added warmth