Helly Hansen Women's Warm Freeze Half Zip Baselayer 57% merino wool/43% polypropylene Imported Non itch, allergy neutral Hollow core Lifa fibers next to skin and super fine merino wool on the outside to keep you warm Designed for variable intensity activities when it's cold Flat lock stitching Thermal baselayer with a perfect combination of comfort and performance Chafe-free comfort; bulk-free fit