Here's what other sites are saying:
This Ibex balaclava uses pure merino wool to keep your head and face warm while you enjoy cold-weather activities. 18.5 micron merino wool has a soft hand that is comfortable next to skin; merino wool insulates, wicks and breathes naturally. Flatlock seams allow the balaclava to be worn comfortably under a helmet. 1 size fits most.