Material:

Upper: Birko-Flor; a skin-friendly, durable, and easy-care synthetic material. This is commonly used by Birekstock.
Insole: Natural leather.
Midsole/footbed: Cork
Outsole: Super-grip, anti-slip, and oil-resistant rubber outsole with cushioning EVA midsole

What we like about these shoes:

Wide toe box
Flat sole from heel to toe (though shaped insole)
Very good grip in the sole
Adjustable fit thanks to the buckle
Good choice for those who walk a lot on hard floors at work and need cushioning in their shoes

Fit and size advice:

Width: Suitable for normal to wide feet
Suitable for normal to high insteps
Size: Large in size. Check the size chart below
Feeling on the foot: The sandals feel really comfortable on the foot! As we mentioned earlier, they are large and spacious in size. Fanny has wide and high feet and usually wears size 40 in her shoes. In this pair, 40 is too large, making it difficult to tighten them properly, so she needs to go down a size to make them fit well. The sole feels really stable, and Fanny finds that you could easily walk with them on harder floors and still have enough cushioning, but if you want a sandal with a barefoot feel, this model is not the right one for you!