The floating sunglasses are designed to stay afloat on the water's surface when they fall off your head. They also have a strap that you can use to secure around your neck, so they won't float away if you take them off while kitesurfing or paddleboarding. This strap can be adjusted or replaced when the unit is not in use. They also come with an anti-fog coating on the inside of the lens. This helps to prevent your glasses from getting blurry or foggy once you get into the water. The floating eyewear can be used to protect your eyes against harmful UV rays from the sunlight. Floating sunglasses are handy for all water sports, including Kiteboarding, SUP, kayaking, fishing, surfing, and sailing.