The line on a mountain above which snow never melts. The lowest limit of perpetual snow in the Alps is at 9,000 feet above sea-level, and in the Andes, at the equator, 16,000 feet Snow-shoe. A flat shoe worn to keep the foot from sinking in the snow. The frame of wood is three or four feet long and about a foot wide, with thongs or cords stretched across it, and having a support and holder for the foot.