This puddle jumper from Swim Essentials helps develop swimming abilities while also building confidence in young swimmers. It is the best accessory for parents that want to help their kids learn to swim for the first time or built confidence to swim on their own. The puddle sweater swim straps are attached to the back and cannot be removed by your son himself. This ensures that your kid is safe in the water. The carrying capacity of the puddle sweater is 15 to 30 kg, which is approximately equivalent to an age of 2 to 6 years old. The puddle sweater consists of one piece that is attached to both arms and the chest with a buckle on the back, so that the whole thing stays in place while swimming. The inside is made of foam and provides plenty of room to move.