All About that Base When the mountain calls for an extra layer, these pants hit the sweet spot for warmth and breathability. The women's Burton Midweight X Base Layer Pants will keep your personal climate under control, so you can worry about important stuff like which run is next and what to eat for lunch. Features: Plenty of Tech and Stretch : Midweight DRYRIDE Ultrawick polyester is highly breathable and ultra-fast wicking with plenty of stretch for an unrestricted feel. Stink Less : The sustainable odor control of HeiQ Fresh keeps it fresh without limiting breathability. Low Environmental Impact : Bluesign® approved materials reduce impact on humans and the planet during manufacturing.