The SWIMS Loafer is primarily made of rubber, antibacterial mesh and EVA. Total product is recyclable. All materials go well with water. The products have vents for breathers which also allows water to flow out when worn in water. All elements of the SWIMS Loafer are molded. The sole is made of natural rubber, and are designed to maximize traction. It's a non-marking sole ideal for Yachting. The innersole is made of antibacterial EVA, a foam based material with excellent comfort, durability and anti smell. Swims tend to run large we suggest sizing down.