These are the older (much better) model of Scarpa Phantom 6000 mountaineering boots. The size is appropriate for Men's 9.5-10.5, although Scarpa didn't write the size anywhere so I can't confirm the exact size. They're sized appropriately to wear thick socks and allow for foot swelling at altitude for someone with Men's size 9.5-10.5 feet. 

They've been worn exactly twice and are excellent for keeping your feet warm whether you're climbing Rainier (or Denali or Aconcagua) or just ice climbing. They're quite lightweight but are exceptionally warm.

Purchase price was about $950 a few years ago and they're in perfect condition, including the watertight T-Zip front zippers. Price is $425 and willing to ship anywhere in the USA.