Birkenstock women's "Arizona Big Buckle" sandals crafted from lilac EVA, a premium plastic material that is odor-neutral and certified non-toxic. Lightweight and elastic, EVA is also waterproof and skin-friendly, delivering the signature Birkenstock comfort in a practical, modern version. The two-strap design is enhanced by the iconic Big Buckle in stainless plastic, chosen for its durability and minimalist look. Narrow fit.