If your extremities are cold, it helps a lot to keep your torso and limbs warmer.
Surplus wool glove liners work well and are durable, if not super UL. If you buy 2 pair, they are easy to double up, and are pretty warm like that.
If you get two pair of the same size, they will run a bit small, but when you start wearing holes in the outer pair, you can switch them hand for hand and inside to outside. This puts the holes on the back of your hand in the inner layer.
If you get one size larger, they don't have the extended durability, but do fit a bit better because the inner one doesn't wrinkle as badly. When those start to wear, you can cut the outer fingers off, and you end up with a fingerless layer over the fingered gloves, which is fine unless it is REALLY cold, or you buy a new large size outer layer.
My pair, that is missing both outer thumbs, is 4.5oz. With both liners complete, and the rest of your clothing done well, they are good to at least -10F, and work fine lower than that, though not without the need to warm up periodically.