People with wide and taller feet, probably need to go a half to a full size up. I wish the rapid-fire button was even faster. It will also recharge from another powerbank but not while lit. I bought a second pair and I plan on buying work shoes from the same manufacturer. I will be ordering again for sure! Well done product. If you have small shoes/items on it , or you are a Liliputian youll be fine. Great shoe I highly recommend! Unfortunately it seems that even with babying the headphones, they just wont last. I wear an 8 and had to give it to my little brother