I have used these at Nepal Mera Peak. It was -5F and my hands/fingers were warm. I strongly suggest to Eddie Bauer to add wrist straps for these mitts. Also, the page says that mitts are "waterproof", I'm not sure if that is true or not. I think it's a marketing statement just to sell more of these. Why do I say that? Eddie Bauer does not say what type of material is used to provide the waterproofing. When you call customer service at Eddie Bauer, they have no idea. So, gloves should be waterproof, great, what makes them, what material? No one knows, not even Eddie Bauer.