The Summit County III has been discontinued. It was replaced by the Keen Summit County.
Mountain Gear says:
Serious winter performance in a masculine, technical hiking boot. The warmest insulated boot from KEEN's winter line, the Summit County III features 400g KEEN.Warm insulation and a waterproof, breathable membrane. Shellback heel support provides additional stability and is easily snowshoe compatible. The dual-climate weather outsole gives you sure-footing in slick, wintry weather.
Historic Range: $74.83-$118.99