These mittens SHOULD be very warm, but the cuffs are so tight that they actually make my hands cold!  I am a small person with very small hands (I'm 5' 4" and weigh 122 lbs), so they actually fit my hands well, but the cuffs are just too tight and I don't use the mittens.  If it weren't for this feature, I would have given these a 5-star rating.