These mittens are awesome! Extremely comfortable, extremely warm. I almost never use the fleece liner gloves cuz the shell by itself is so warm. Their are two different ways to tighten these up to keep snow out. An elastic pull at the bottom of the glove that can be pulled one way to tighten up and one way to loosen (so you can do either without having to use both hands) and one higher up towards the base of your thumb (the wide strap across the back of the glove seen in the picture above). Using them together makes it easy to keep my coat sleave over my glove to form a total seal. I've been snowboarding in negative fourteen (it was pretty miserable) but my hands were nice and warm with the liners in.