Shop L.L.Bean for Men's long underwear and base layers. Whatever your outdoor layer needs are, we have the base layer for you. Our wool base layer is ideal for midweight warmth for a variety of outdoor activities. Choose our thermal underwear for a supersoft layer for all-day comfort. Our long underwear selection will keep you warm on chilly nights with long johns for subzero temps. We feature top brands like our Under Armour base layer and our Hot Chillys base layers. L.L.Bean Men's long underwear and base layers are made to fit your outdoor needs and your budget, and they come with our 100% satisfaction guarantee. L.L.Bean base layers are always Shipped Free with $50 purchase and guaranteed to last.