The classic symptoms of vitamin D deficiency is rickets in children and osteomalacia in adults. Rickets can cause skeletal deformities, such as thickened wrists and ankles. It can also cause muscle weakness and pain in the back, pelvis and legs.
Birkenstock products are offered in European sizes. Please reference our Size and Width conversion charts below. You can determine your Birkenstock size by adding 31 to your U.S. womenâs size and 33 to your U.S. menâs size. Your feet should be able to move freely without your toes hitting the edge of the footbed.
The Birkenstock brand traces its roots to Johann Adam Birkenstock, registered in 1774 as a vassal and shoemaker in local church archives in the small Hessian village of Langen-Bergheim. In 1897 Johann's great-great-grandson Konrad Birkenstock developed the first contoured insole for use by shoemakers in the production of custom footwear.