pnwoutdoors
Enlightened
That's 100 grams? Wow! Not bad.
That's what they claim, on that model from Kinco. Pretty thin stuff, actually. My own preference would be for 2x to 3x that amount of insulation, at least for gloves intended to be used in sub-0ºF temps.
I'm fairly impressed with how quickly they broke in, and how flexible the cowhide has ended up. The first 4-5 days of wearing them, I was noting the "sausage fingers" feeling ... they were stiff to the point of needing to deliberately squeeze the fingers down to complete a fist. Now, they're perfect.
Though, as you say, bulkiness is a potential problem. But I would think, with the various textile mixes they're capable of, that it can't be very hard to put a decent amount of insulation in that'll still allow for good articulation.
Some models of gloves are essentially a 5-fingered glove inside of a mitt. From the outside, they look like mitts, but they've got more insulation and ought to be warmer. Assuming they haven't over-done it and allow for reasonable dexterity. Haven't tried any of those, yet. But this cowhide model from Kinco seems sufficient. Quite comfortable, once broken-in.