The Blue Footbed The Blue Footbed is ideal for anyone wanting to enjoy Birkenstock’s unique comfort in closed shoes by other manufacturers too. It is available in three widths and two designs. Whereas the Blue Footbed “Tradition” is more suitable for shoes with heels due to its higher arch, the Blue Footbed “Sport” is recommended for shoes without heels. The Blue Footbed takes less room in the shoe than regular insoles is manufactured from natural materials and ensures a healthy foot climate ensures an optimum spreading of the weight In case you’re wondering: the Blue Footbed has a three quarter length in order to ensure a perfect fit. Because shoe size can be different from the size of the feet. For this reason, the footbed has to be carefully adjusted by your retailer before purchase.