They are fun and kids WANT to wear it. Sea Squirts look like fish for a serious reason. Each design has a flexible fin on the back to help kids get carried away with creative play. It"s a brand new idea and there"s nothing like Sea Squirts on earth. * Designed with 3 removable flotation panels that provide help with swim instruction progression (remove them as the swimmer masters each level) * Fin folds over when leaning back for active use and can be used as swimming aid. * The arm-hole sizing insures a proper comfortable fit so the strap between the legs doesn"t have to be too tight. * Warning: this is not a life jacket; this product will not keep a child in the upright (vertical) floating position. Use only as a swim training device and with the child within arms reach at all times.