The SWIMS Sport Loafer Boat Shoes are water friendly and fun to wear. SWIMS are made from a durable and flexible TPU outer shell with antibacterial mesh and breathable nylon upper accents. SWIMS outsoles are made from natural rubber that is anti slip and non marking making them perfect boat shoes. If you have not worn SWIMS before please view the size chart before purchasing. SWIMS shoes run large, so if you normally wear a size 10 in most shoes in SWIMS you may consider a size 9.