The TULIP shoe is made with immaculate detail, ensuring a soft fully flexible sole in durable natural rubber and upper sole made from sustainable recycled microfiber. Very comfortable to walk in with a thick, cushioned sole and anti-chafing materials. European size 37 translates to a US 6.5 however, these shoes run a little big and fit more like a US 7. Be sure to bundle and save! I'll always accept reasonable offers!