I can't imagine these as liners, as they are very bulky, BUT they are warm enough to be worn on their own, and they are waterproof (or resistant). While the battery is bulky, I love how easy it is to get in and out of the battery pocket, and you can test them to see how much battery is left, so you don't get caught with a dead battery by mistake. I have this pair and a leather pair by Volt, so I always have a pair of batteries charging. I also love the way the batteries attach. They have a release that has to be pushed to get them on or off both the glove connection and the charger, thus they don't accidentally come off. I've had trouble with many failed batteries with another brand, so I am hoping that the Volt batteries will be better, but I haven't had them long enough yet to comment on that