Existing modelNearly two decades of research in Yosemite's legendary Camp Four campground produced this rugged, light-weight hiker. The shoe soars on multi-pitch aid routes, and is the shoe of choice for climbers running up Yosemite Falls for a sunset slackline of Lost Arrow Spire. It is light enough for everyday wear, but extremely rugged, and a trail- smart alternative to heavy, clumsy leather hiking boots. The Camp 4 features Five Ten's proprietary molded-PU external heel cage to maximize heel support and stability, allowing you to move with the agility of a mountain goat. Soles are proprietary co-molded Stealth C4/S1.