BC skiing I wear my wool liners and leather gloves even below zero deg F.......
Any aerobic activities and my wool liner/leather gloves work.

Liftserv skiing I use Kinco insulated ski gloves (leather with their patented Heatkeep synthetic insulation.........If it is really cole (below minus 5 F) I add a wool liner to that ski gloves......

Belays or camping out I use mittens at rest........

HTH
A