Delphin Swim Disc Set - Children Swim Training Aids The safest and easiest way to learn how to swim. Safer than inflatable armbands. Free, unobstructed movement of arms and body thanks to concentric, flexible armholes. Soft, skin-friendly polyethylene foam. No functional failure when damaged. Safe swimming aid that will fit the arms of any child. Designed and manufactured in Germany. Do not be fooled by cheap imitations!