evo.com | Burton Long Underwear Tops > Real mountain warriors know the key to staying warm on the hill starts with the layer that's closest to the skin. With a super warm base layer like the Burton Heavyweight X Quarter-Zip Base Layer Top, you can be toasty warm in your shell, even on the coldest days of winter. bluesign(R) Approved The bluesign(R) system unites the entire supply chain to reduce impact on both humans and the planet. bluesign(R) approved materials are guaranteed to use only safe chemicals and are manufactured to meet the highest standards of natural resource conservation, consumer and worker health, and clean air and water discharge during the manufacturing process. This product may contain chemicals known to the State of California to cause cancer, or birth defects, or other reproductive harm. Quick Drying and Highly Breathable Four-way Stretch Fabric Slim Fit Sits close to the body, with room for the garment to move with you. | Women's Burton Heavyweight X Quarter-Zip Base Layer Top 2026 - Large Black