When I first get this shoe, I planned to use it only for indoor bouldering. However I used it even for outdoor crack climbing (that was pushing too much though). It is an amazing shoe, performing extremely well, but only after getting used to. It is too soft, so it "really" hurts at the beginning, especially when climbing outdoors. Once you get used to use your foot with this shoe, it holds amazingly. I really like it when I use my toe to "grab" some holds, which is impossible with the harder shoes. Overall it is a great shoe for bouldering and slab climbing, and works still good on vertical stuff.