Friction Resistance and Bright Colors: Our swim buoys are made of durable, scratch-resistant nylon fabric / PVC material, strong enough to cope with friction encountered in seas, providing swimmers a safe way to float and rest during swimming. Pair this brightly-colored swim float with a swim cap to be exceptionally noticeable. Improve your visibility to avoid getting decapitated by a jet ski or a speed boat. With Dry Bag function: The buoy has storage space to keep personal items dry, never worry leaving your keys, cellphone, towels & wallet on the beach when you are in the water for swim. Keep important items with you, suitable for you and your family. Easy to Use: Swim buoys will swell as long as you gently blow. When you are using them, you will drag behind you gently without pulling back or increasing resistance to swimming. 20L Capacity: Swimming buoys provide peace of mind for safer swimmers by increasing visibility and a sense of floatation in case you have cramps or just need rest. Swimming bubbles are very light (8 ounces), so it's easy to travel with a paddle board or kayak. The buoys and foam-safe swimming series increase your swimming safety. Triathlon Training Buoys: Made in accordance with triathlon standards, the colorful, this buoy will help track or log your swims with a coach, lifeguard or swim buddy.