Not every day calls for things to be laced up, tightened down and serious. Sometimes it's nice to be able to toss your boots on, or off easily, with comfort to spare. That's why we built the Mountain 600 Chelsea. We borrowed the ultra-cushioning Vibram SPE midsole from our award-winning Mountain 600 to provide daylong comfort. For the sole, we kept the same lightweight, but grippy, Vibram Fuga outsole that makes the Mountain 600 so capable. A full-grain leather, non-waterproof upper matched with a flexible Ariaprene collar makes the Mountain 600 Chelsea slip on or off easily Ã perfect for kicking around town or working on a project close to home.