The Burton Men's Heavyweight X Base Layer Pants will keep you warm even the coldest days on the mountain. They are made with Heavyweight 300 Living Lining® that provides consistent temperature regulation without adding bulk or weight. Keep your phone in the stash pocket for easy access, while four-way stretch fabric gives you flex on the hill. These Burton Heavyweight X Base Layer Pants have a stink-resistant finish, so you can get after a pow-day and still have friends when you leave. Just as you, Burton has the planet on their mind and made these base layer pants bluesign® approved, which means that the materials for this product use only safe chemicals and reduce impact on both humans and the planet during manufacturing. Suit up in climate-controlled comfort with the Burton Men's Heavyweight X Base Layer Pants!