That is, the foam has completely collapsed. I am usually a size 6 or 6. I ended up going the middle route. 5hours to charge that really save time. I still love these wheels and would highly recommend because these wheels make it even more fun to skate in the rink when the lights go down! Update:After just over a year, one of these failed. I cycle on roads and cycle paths low impact flat terrain. Buen material, muy resistentes, soporta buen peso. This would have a five star review if the container was aluminum as described. So only time will tell how they hold up.