It's not every day we find a slip-on shoe we're confident wearing beyond slab ramps and vertical faces, and the Instinct S Climbing Shoe is the proud exception. Its soft midsole and sticky rubber deliver the sensitivity we need when moving through delicate feet, while the ribbed upper toe box thrives on toe hooks in caves. Since this shoe stretches about a half size, we sized down for bomber heel hooks usually only associated with lace-up shoes.