I even offered to send them back. The best thing about this Mr. Very wide on feet and the heeled are rubber and not the same thickness all the way across ! I was totally gobsmacked that you could do this! Ive looked all over the internet, and messaged Sennheiser. As soon as he opened it he bluetoothed it straight to his phone and said it sounded like surround sound. Not sure what the"warmth" category is! It is great having these options. I think it depends on if you prefer to wear your slippers with socks or not. Super