The old cheap way works quite well for the sorts of things this complicated and expensive solution would work for; liner gloves in mittens, when you need dexter

The old cheap way works quite well for the sorts of things this complicated and expensive solution would work for; liner gloves in mittens, when you need dexterity just pull of the mitten but leave on the liner, do what you need and then put the mitten back on. I like the merino wool liners, thin but dense and give great dexterity.