While the new Apple iPhone 7 Plus has an IP67 dust and water resistant rating, the Apple standard warranty does not cover water damage. If you plan to use your phone in a wet environment, and not just occasionally get it splashed, then you should consider one of these Dog & Bone cases.
The Wetsuit case is available for $89.95 in four different colors. It offers IP68 dust and water resistance with MIL-STD 810G two meter drop protection. It has an interesting approach to the display, which can be seen in later photos.
The Splash44 case doesn’t increase the water resistance, but it does offer the same MIL-STD 810G two meter drop protection along with a tempered glass screen protector. The camera and Lightning port are also sealed up to try to improve the iPhone’s water resistance. It is available in four color options for $59.95.