"One of the lightest backcountry fat skis going, the new Monster O.B. weighs a mere 7.1 pounds. The low mass comes from Heads Aircoat Hollow Glass Technology, which, due to the hollow fibers, is 40 percent less weight than regular fiberglass. Despite the low weight, however, the fibers have higher compression strength and a higher specific strength than any solid fiber. Also comes equipped with a notch on the tails for skins. Why dont more skis have that?"