Coclico shoes are sized EURO 36 - 41. Below is a size conversion chart comparing Spanish sizes to US sizing standards. To find your best Coclico size measure the length of your larger foot. Place your heel against a wall and measure from the wall to the tip of your toe. When measuring, wear socks or tights if that is how you intend to wear the style. If you fall between two sizes, go with the larger. Still not sure? We're only a chat away and are always happy to help (206)749-9698