I took them out tried them on and they fit. The wonderboom 2 has all the great features as the original but with improvements. I would order maybe a half size up. It was my fault for not installing or testing the unit sooner, but again I felt the product would be in working order. It doesnt really feel like it helps much. The base design, probably kick the pole in the middle like 4 times already but it does feel secure. So now I have 3 carpartments with no door. He loves these shoes. Bonnie wanted to be sure I was satisfied with their product. One of my Chacos has a smooth footbed, but I like the ones with the texture better as they hold up to sand and other wear better.