This product is inspired from stingray. we used the shape and combined with smile in order to link the ocean, water, and swim. Our target audience are toddlers, so it must be interesting, we have test many times about the efficiency and proved it works with kicking in the water. It truly let kids happy. it is soft, light, durable, and floating for beginners. Practice kicking right way,recommend users:4-8 years old kids to use.the best one is COTAfins designed with 3 in 1 strap.Prevent resource wastes. save money and recycle use.