Boulder Canyon has a handful of classic, devious slab routes on glassy granite. These moderates sometimes pitch 5.13 climbers right off their tiny scoops and dishes. Better bring the Instinct S SCARPA's softest shoe, with Vibram XS Grip2 to hang on to the subtlest features. But don't quit at slab these train hard, pull plastic, send on techy terrain. The Instinct S's elasticized fit and synthetic microsuede upper stay sensitive for the life of the slipper.