Arizona Chunky SandcastleBirkenstock Arizona Chunky Nubuck Sandcastle Fit Notes The Birkenstock Arizona Platform Nubuck Sandal runs true to size with Birkenstocks signature contoured footbed that gradually molds to your foot for personalized support. Two adjustable straps help fine tune the fit, while the platform sole adds height without sacrificing comfort. Expect a brief break in period as the cork latex footbed softens and shapes to your step. Styling Notes The Sandcastle