The bold, wild, and beautiful Five Ten Siren climbing shoes deliver unrivaled precision and strength. Built for perfect fit and comfort right out of the box. Designed as all-purpose shoes, they're at home on any rock surface. Features Five Ten's top-of-the-line Stealth® Onyx; rubber sole (stickiest, most durable, and hardest rubber available). Synthetic Cordura® nylon upper won't stretch and performs for the life of the shoe. Full lace-to-toe design for custom fit. All-around shoe for all levels. On sizing, please note climbing shoe sizes are only a suggestion as fit is highly personal. Foot shape, use, and style all play into size selection.