Unisex Aqua Boot with Inner Zip Fastening, Reinforced Upper, and Contoured Outsole. Thickness: 5mm. Stay comfortable and protected in the Trespass Unisex Aqua Boots Raye. Perfect for any water adventure, these boots offer durability and style. Inner Zip Fastening: Stay dry and stylish with an inner zip fastening for easy on and off. Reinforced Upper: Our Raye aqua boot is built to last with a reinforced upper, providing extra durability and support. Contoured Outsole: Experience ultimate comfort with the contoured outsole, designed to provide maximum traction and stability.