Yamaha Hydroshoe - Yamaha Black 12 - MAR-19SHD-BK-12. High-Performance Footwear for Marine Adventures. Engineered for Yamaha enthusiasts, the Yamaha - Hydroshoe-Yamaha Black 12 - MAR-19SHD-BK-12 delivers all-day comfort, superior grip, and rugged durability on and off the water. These size 12 water shoes are designed with quick-drying, breathable mesh and a supportive sole that grips slick decks, rocky shorelines, or muddy launches.. Ideal for boating, fishing, paddling, or just enjoying a day o