The sole and the toebox are much stiffer, uncomfortably so. I have lots of Sennheiser gear, and thought these would be a sureshot, I was wrong, and totally disappointed. I wear a shoe size 8, typically, and got the size 7. I hope you find this review helpful in making your decision. The lock feature is easy to use. Theyre really cute but unfortunately I had to return them. I almost bought the Nintendo Switch airpods pro case and the Sorry PSP case lol. Definitely recommend if you are wanting to make the switch from USB to XLR. I read some IG reviews of customers who hadnt received their items yet. These slippers are so comfortable I wish I could wear them as shoes!