What does, is the material inside the shoe. These are the coziest slippers ever! O som nao sai com boa qualidade. Ich zumindest schwitze keinesfalls mehr darin als in normalen Ledersohlen. The pair was a good match in size and clarity with one being ever-so-slightly more clear and brilliant. When paired with the MixAmp Pro and an A40 headset, the sound is compressed, and more importantly, people in your party can hear an echo of their own voice! Its sturdy, great coverage, does not ride up, and easy to put on in a snap. I have absolutely no concerns on how sturdy it is. He says it?s very warm. I based my order directly from the size chart and an answer from the company (someone else asked) that said if you wear a size 8.