First, this doesnt work at all because its presented as a joke. El velcro de detrás no me ha dado ningún tirón de cabello ni nada parecido, funciona muy bien y lo puedes apretar cuanto desees. 5 - 8, my feet are on the slightly wide side, and I bought these in a size 8M. I could have posted a pic but its better for everyone if I dont. Somehow I thought with all of the positive reviews, perhaps I just received bad pairs. Estan muy muy bonitas las pantuflas. Trop grandes…Trop chers pour ce quelles sont+Look propre. I say dont waste your money on these. I can control my music including other music apps and had no issue pairing to my Android phone. Theres some weight to this speaker, but at 30W its expected.