Cowhide on the palms and digits provide durability where needed. GoreTex XCR insert provides ample breathability. Fibre pile on the top of the hand keeps you plenty warm, whilst the lower profile fleece is on the underside. This allows for warmth without inhibiting dexterity.
My other Gloves are Hestra Seth Morrison Pro. So far my Couloirs have out performed my Seth Mos, the Couloirs felt warmer and have kept hands dry even when I've been skiing in the rain.
Misc: Remember to balm the leather areas as you would with any leather glove. When choosing a size make sure the semi gauntlet interfaces with your jacket how you want it to. The overall fit of the glove feels fairly true to size.