I love these mitts. I suffer from cold hands. We skied for a few days in very cold temperatures (-15 to -20) and I was able to go for 1 1/2 hours between trips inside to warm up. My hands were mildly cold instead painful blocks of frozen meat. They are true mittens without those weird gloves-inside-the-mitten so I was able to curl my thumb in with my fingers to warm them up.