Faux leather Soft soles Foot pad inside I measure my shoes as accurately as possible from heel to toe of the soles but I always recommend you add yourself a little wiggle room when selecting a size Size 1 (0-3 months) 4 inches Size 2 (3-6 months) 4.5 inches Size 3 (6-12 months) 4.75 inches Size 4 (12-18 months) 5.25 inches Size 5 (18-24 months) 5.5 inches Size 6 (24-30 months) 6 inches Sale on select colors only Must bundle with 4 other items marked ❣️5 for $25 to get the discount deal.