I was also surprised in the quality of attachments that come with this set. I wear a size 5, so these were way too big. (All of these are listed in the manual, no worries! I tested the unit using a 15. I really liked these but unfortunately in the past my feet don’t like the toe posts in flip flops. I use them 24/7 perfect with fuzzy socks if you’re always cold like me, I’m always excited to wake up and but these on :) amazing quality, right size, and the case it came with was super cute and reusable! The shoes have always been sturdy to the touch and durable - the only reason I need to get a new pair is because my daughter outgrows them. Priced way to high for what they are & material cost used to fabricate them. I didn’t find it easy to assemble because the pieces didn’t come with holes to place screws and the pictures are tiny and not all of them specifically mention which side should be up when screwing pieces together. Im size 8 and found mediums perfect.