First off, I want to say that I love this toy, Its a really great way to help with kid wiggles. Its also a way to get severely injured if you dont have proper rules in place or are not supervising your children while using it. I literally turned my back on my daughter for one minute - I was in the same room - and wham, blood everywhere, split lip, likely soon-to-be-gray-teeth and an entire swollen mouth later, I learned what every parent needs to know before using this thing...DO NOT let them put blankets on it, I would also say NO SOCKS allowed ever. My daughter was building a bridge (she put it upside down) and wanted the bridge 'to have color', so she put a blanket on top of it and then stood on it and slipped right off....face first. Major parent fail here....just want to warn the other parents what could happen if you aren't careful. Sadly, I am returning this because I dont want another accident.