The classic Birkenstock Arizona has been given a new and modern twist for adventurous kiddos. The Birkenstock Kids Arizona Birko-Flor Sandals - Narrow feature an upper made of skin-friendly and hard-wearing Birko-Flor® in a sophisticated nubuck look. Birko-Flor synthetic nubuck is made of easy-to-care-for and hygienic PVC, which has been lined on the inside with a soft, breathable layer of fleece. The straps can be individually adjusted using two sturdy metal buckles, providing kids' feet with protection and grip, even when things get boisterous.