Have you ever sat on the couch with a blanket and then your feet get cold, but the blanket never seems to get your feet warm until you tuck the thing all around your feet? But then- your feet get too hot and you don't know what to do? Oh. And. Have you ever wanted to be a mermaid but you live in the Midwest where there is no ocean to be found? Then this product was made for you!! Don't fall for any of those imitation tails that don't have a large enough waistband for an adult, and have sealed tail fins that limit mobility to ZERO!