Birkenstock® Size and Width Chart Please be advised that the Birkenstock® Narrow width accommodates both traditional narrow and medium widths. The Madrid Big Buckle by Birkenstock® is the iconic style you love, with contemporary and bold buckles you'll love even more! Premium leather uppers with an open toe. Slip-on slide with an adjustable buckle closure. The leather lined, contoured cork footbed will mold to the shape of your foot creating a custom footbed that supports and cradles you each and every step. Raised toe bar is designed to encourage the natural gripping motion of your feet, exercising your legs and aiding circulation. Neutral heel profile and deep heel cup keeps the natural padding of your foot where it belongs, under the heel, distributing your body weight more evenly. Flexible EVA outsole offers lightweight, shock absorbing support with lasting durability. 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. Made in Germany. Measurements: Weight: 7 oz Product measurements were taken using size 38 (US Women's 7-7.5), width Narrow. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.