Birko-flor Upper - made of acrylic and polyamide felt fibres with a leather-like texture on top and a soft fabric underneath against the skin and a durable smooth like leather appearance - it is Birkenstock's alternative to leather Birkenstock NARROW width Slip on closure with adjustable straps for easy on-off wear and a custom fit Leather lining for an abrasion-free environment for all-day wear Contoured cork-latex footbed will mould to the shape of the foot creating a custom footbed that supports and cradles every step Raised toe-bar is designed to encourage the natural gripping motion provides aid in circulation and exercise for the legs Natural heel profile and deep heel cup keeps the natural padding of the foot where it belongs, under the heel which helps distribute body weight more evenly Flexible EVA outsole offers lightweight, shock absorbing support with lasting durability Made in Germany HEAT WARNING Cork footbeds or EVA soles can be damaged by exposure to concentrated heat. Do not leave your footwear in direct sunlight or in closed cars on warm days. If your footwear becomes wet, allow it to air dry slowly, away from direct heat. THE CORRECT FIT Open the strap(s) and step into the footbed. Be sure to have several millimetres of room for your heels and toes. Close the strap(s) comfortably around your feet. Leave enough room to allow your feet freedom of movement when you are walking Take a few steps in them (on carpet). If your feet can move freely when you are in motion and they do not hit the footbed edge, you have the correct size!