The first Michael Phelps swim method line of products had been developed and designed by Aqua Sphere in close cooperation with Cathy Bennett, DIRECTOR of the Michael Phelps swim school. The product line's intention is to accompany this Program by offering purposeful equipment so that children can safely learn to splash, float, swim and train. When a child moves beyond the need for the more substantial support of the swim vest, the next step can be the arm floats, which start to wean her off the need for floating assistance. Our arm floats are made from a soft fabric around foam that is comfortable against her skin -- no scratchy or sharp edges. The inflatable internal bladder ensures a perfect fit.