Described as a “Sports Wool” in the publication Knitting to a budget by P&B:

Patons Glengarry knitting is similar in character to Patons Moorland Double Knitting but is lighter in weight. Fabrics knitted from these two wools can be brushed by a special machine to give them a rich, furry surface. ….garments cannot be accepted for brushing after they have been made up.