Everything about the Scarpa F1 Alpine Touring Boot encourages swift skiing and skinning through the backcountry and beyond. Its Grilamid construction includes Scarpa's Carbon Core for enhanced rigidity at a ridiculously low weight, and while you won't feel heavy-footed on the ascent, you'll also feel light and nimble on the descent with a moderate 95 flex. A wide last gives a roomy space for your foot stay comfy on extremely long tours, and the Intuition Pro Flex Evo liner is heat-moldable for a custom fit for even greater comfort. Scarpa updates this year's model with a Carbon Core Evo backbone that ensures a consistent 95 flex. Unlike walk modes with flimsy pins, the F1's burly latch also maintains a consistent flex for a long-lasting performance. Although the brand's size chart has recommendations for how to choose your size, customer feedback suggests this shoe runs small, we would suggest sizing up if you are unused to a tight performance fit.