They have a sticker stating it is a tight fit but neither myself or my husband could get them totally together. Assembly was painless as well. non of my other champs have been like this. I like the fact they made them with the yoga mat material but as you are walking in the shoe you can feel the nobes of the slipper at the foot toe, not good if you plan on wearing these all day. -Do use the repellent spray every month or after every wash. I cant fault the Active noise cancellation, it works wonders! My 7yo has been using these headphones for online schooling/google meet classes. It will get used up before then for sure. This thing is honestly fantastic. - The pockets are awkward.