I am sorry to say, After some research on both official Birkenstock USA and Birkenstock UK websites, I have determined these must be fake. Ive had these for over a month and theyre holding up very well, I can tell they will last a long time. Its quality over quantity here, but such finesse for what is a sub £500 headphone. The size was spot on, the arch supportive & I only felt a tinge of a pinch near my toe. These little lights are the best and do exactly what you want them to do. Painful to assemble and the plastic pieces that hold the metal rods together bend and break easily. As you can see in the photos, both the hall and master bathrooms came out splendid! mistake! However it is important to note that these are only for the bikes with tiny wheels such as the balance bikes. Paint on flip flop stained the bottom of my foot.