The Circuit II uses a neutral, flat last with a slightly wide toe box and a leather upper that will stretch to mold to your foot. Red Chili recommends sizing based on experience: beginners should stick to their street shoe size, while advanced climbers can go down one size for a tighter fit. If you have narrow feet, you may find the toe box too roomy. The dual opposing Velcro straps make it easy to adjust, and the ankle padding adds comfort for long days.