Trailerable Custom Fit Yamaha Cover by Covercraft. Provides maximum UV protection. Durable stitch on Ultra'Tect material. A heavy duty Yamaha Waverunner cover is a protective cover designed specifically for Yamaha Waverunner personal watercraft. The Yamaha Waverunner is a popular model of jet ski that is known for its high performance and reliable engine. A heavy duty Yamaha Waverunner cover is made of durable materials like waterproof polyester or canvas, and is designed to withstand harsh weather conditions such as high winds, rain, and snow. These covers are often fitted with elastic hems, straps, or bungee cords to ensure a snug and secure fit, and may also feature vents or mesh panels to allow for proper air circulation. Heavy duty Yamaha Waverunner covers are designed to protect the jet ski from damage and deterioration while it is not in use, and can help extend the life of the watercraft.