When hiking I use a super thin softshell glove with leather palm/fingers that OR used to make. I lost them in the Wahsatch over a couple days ago and replaced them with this seemingly almost identical product (in the mail, haven't actually seen them yet):
Backcountry.com In Motion Glove - Men's from Backcountry.com
The ones I lost were thin and super breathable. Only when it was 50degrees and sunny the other day during a tour did it get so warm I had to take them off. My dexterity was good enough to take off skins and transform my splitboard. When my hands get cold or I want a gauntlet for the descent I put these on overtop:
Outdoor Research Endeavor Mitten from Backcountry.com
Super lightweight gortex paclite. Added to these I also bring along ultralight puffy mitts that will also fit inside the shell mitt for when the temp takes a hard digger. All three together are lighter than most gloves out there. It took me a long time to dial it in with the right stuff but I'm always comfortable now.