Recommended 0-1 years old (reference foot length 9-11cm)(Class A quality) Recommended 1-3 years old(reference foot length 12-14cm)(Cotton material) Recommended 3-5 years old(reference foot length 12-14cm) (Cotton material) Recommended 3-5 years old (reference foot length 12-14cm) (cotton material) Recommended 3-5 years old (reference foot length