With four buckles and a dual-density shell, Scarpa's top-of-the-line T-Race is basically an alpine boot with a bellow. This year, it's been upgraded to include Scarpa's signature Intuition custom thermo liners, which are lighter, easier to mold, and have fewer pressure-point-creating seams. 8.6 lbs; scarpa.com
Bonus: The heavy-duty cam-lock booster strap acts like a fifth buckle.
Bummer: They're almost too stiff for all-day tours.