Reports of over sixty instances of feet getting stuck on escalator grids since last summer led to an investigation into the safety of Crocs on escalators. Crocs are made of resin; they’re soft, stretchy, and not very slippery on non-lubricated surfaces, like many escalators. And they’re still relatively popular in Japan. One five year old girl broke her toe trying to get off of one when her foot got stuck in the side of it. Ouch.