Rubber+Pu sole [ QUALITY ] - High-Quality PU Leather Upper with Comfort Cotton Lining. No Any Stimulation to the Skin of Baby's Feet. [ EASY WEAR ] - Adjustable Hook and Loop Closure Design Make Our Infant Flats Easy to Put on, Take off, and Stay on Your Baby's Feet. [ ANTI-SLIP ] - Soft Soled with Anti-Skid Dot, Which is Good for Baby's Feet to Learning Walking. Good For a Healthier Growth and Walking.