100% Merino Wool
Here's what other sites are saying:
The 66 North Iceland Women's Basar Zip Neck Top adds a little luxury to your long underwear. This layering piece features premium merino wool to keep you extra toasty when you hike, bike, or ski in the cold. Merino breathes well, retains your heat even when it's wet, and resists odor way better than synthetics. 66 North Iceland gave the Basar an athletic fit and flat needle stitching for easy layering and included a front -zip to release excess heat.
- Backcountry Outlet