The Burton Men's Heavyweight X 1/4 Zip Base Layer keeps you cozy even on the coldest of mountain days. It is made from a highly breathable, heavyweight fleece that has a four-way stretch working to give you all the flexibility you need for a solid day of riding. This base layer has a Heavyweight 300 Living Lining® that provides consistent temperature regulation without adding bulk or weight. It is designed with a slim fit that sits close to the body and has enough room for the garment to move with you. Just as you, Burton has the planet on their mind and made this base layer 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. Turn up the climate control on the coldest days with the Burton Men's Heavyweight X 1/4 Zip Base Layer!