Hard to find in USA, but two pairs of Buffalo pertex and pile mitts kept my hands very comfortably warm
commuting 16Miles/25K during the recent polar vortex; 0F/-18C. These are windproof yet they permit
perspiration to migrate to the exterior of the shell, thus keeping the hands dry. Note that these are NOT waterproof,
but at those temps this is not a concern. Not too bulky either.