Birkenstock Unisex Arizona Mocha Brown Birko-Flor Sandal, Mocha, 42 M EU Birko Flor Arizona Sandal from Birkenstock is made of soft acrylic and polyamide felt fibres. This iconic two-strap style, the Birkenstock Arizona Sandal, is known for being the epitome of comfort. Both straps have buckles for a fantastic fit. The suede lined, contoured footbed will mold to the shape of your foot creating a custom footbed that supports and cradles you each and every step. Flexible EVA outsole offers lightweight, shock absorbing support with lasting durability. Please note: Birkenstock makes the Arizona Sandals intentionally roomy for added comfort so they tend to run about 0.5 to 1 size longer than usual and they are also wider than usual. Most people prefer it this way as the straps can always be tightened if needed! However, if you prefer a "very tight fit" AND do not plan on wearing socks; we recommend purchasing a size smaller than you typically purchase. For example, if you normally purchase a size 42 M, we recommend purchasing a size 41 M