I started using these this week when temps were in the 30s. No loss of dexterity, and my hands were warm without feeling sweaty.
My LBS clued me in to 45Nrth so I thought I'd give these a try. I'm so glad I did because the Sturmfist 3 lets me ride in cold weather without the usual agony I experience after 45 minutes. My hands and feet are always cold so I needed a solution for riding mid winter in the northeast. Honestly, this glove is a game changer and besides being very warm they are plenty dextrous to deal with shifting and breaking. I've tried a lot of winter gloves and these are the only ones that are noticeably different from the pack. One last thing, they are super easy to get on and off and the cinch around the cuff is beautifully executed.
Warm hands are a must for winter riding...good into the 20s. Like the single digit vs. a split finger mitt.