Review on Optimized Kids Mermaid Monofin Swim Fin by FINIS by Sean Santhanam

My little mermaid used a different, stiffer monofin for a while. I ordered this one as it was compatible with a skin I had ordered elsewhere. That fin pierced that skin pretty quickly, even with the protector (but I think that's more of an issue with the fabric than the fin). BUT. My kid loves this fin because it allows him to swim much faster than a stiffer one. This turns and pushes her through the water (she weighs only 6 and barely 40 pounds). I'm taking off a star because the heel strap gives her horrible blisters on her heels.