Rubber soleHeel measures approximately 4.25 inches"[ GOOD MATERIAL ] - High quality PU leather, breathable cotton fabric and comfortable soft rubber sole with Anti-skid design.No stimulation to our baby's skin.[ SOFT & COZY ]- Soft, cozy and breathable. Lightweight and flexible to support natural foot movement.[ EASY WEAR ] - A Hook and Loop Closure makes our baby sandals easy to Put On,Take Off and stay on your infants feet all day.[ STYLISH DESIGN ] -The pretty designs are suitable for Formal Occasion, Party, Casual, Photography, Outdoor activities, good for daily use.[ SIZE TIP ] - The Recommended Age is just for your reference,please refer to the Size Chart and measure your baby's feet before ordering these baby sandals.