My new UGG's arrived today just in time for the snow storm that's coming. I have been wearing them all evening, w/o socks, and my feet have been warm w/o being hot or sweaty. This is almost unbelievable for me--I wear clogs or Birks all year long and my feet are used to being exposed so when closed in with socks and shoes my whole body overheats. Should have purchased UGG's years ago, but never wanted to spend the money until I read on the Boot Barn site about how boots should fit and the features of these great boots. I can't say enough good things about my new UGG's. Thanks for a great product.