Our Backcountry Cedars Rws Merino Midweight 1 / 4 - Zip Baselayer Top delivers technical warmth and performance for our full repertoire of winter adventures. Responsible Wool Standard - certified merino wool lends its insulating, thermoregulating, and odor - resisting properties to keep us comfortable and fresh during active outings, and it's sourced from farms that consider the welfare of their animals and their land.