Built with ultra-lightweight ripstop fabric and filled with RDS-certified down insulation, the Mountain Hardwear Ghost Whisperer Pant is our go-to for a cold hike, hanging at the campsite, or layering underneath our ski bibs. The 800-fill insulation provides unmatched warmth on even the coldest days, while the highly packable design makes for easy storage between uses in the included stuff sack.