Sierra says: The women's 686 Betsey Layer Bottom goes great with the top to provide your body with full protection throughout the day. The bottom goes down a little below the knees for a perfect length so that you're socks can come up and just barely go over them and you don't get any bunching in your boots.

Sierra says: The Direct Bottom Layer goes great underneath any snow pant to provide an all day guard against odor and perspiration.