Grand Forest Inc is the US importer and distributor for Woolpower® thermal undergarments and socks. Since 1972 they have been manufactured in Östersund in northern Sweden.
Originally branded as Ullfrotté, these products still maintain the same fabric design and quality. The material is produced in varying thicknesses for different functions and benefits. The thickness of the material is measured in grams per square meter and comes in 200, 400, 600 and 800 grams per square meter.