I am trying to decide what handwear to bring on my Utah backpacking trip. I know mittens in general are warmer, but does that still apply if you have full finger liner gloves and then a mitten shell? It seems like not having contact between the fingers would negate half the benefits of mittens.

I've never really liked mitts because of the loss of dexterity, although I'm not sure I'll be warm enough in gloves with liners. Maybe 2 liners would work, but seems bulky.

What about ski gloves with some sort of overmitt?

Temps will be 10F to 30 daytime, down to negative 10 at night. Very dry environment, although there will be some dry snow.

Any suggestions on which gloves/mitts I should find?