Birkenstock Sierra CT, size 39 men's size 6 women's size 8 dark blue new without tags/box ***please view photos. I've circled where the strap was cut off*** This sporty version of the BIRKENSTOCK Sierra is the perfect sandal for camping, hiking, travel, and all of your adventures. It is designed with active BIRKENSTOCK fans in mind. This version pairs iconic Birkenstock features including oiled leather uppers, classic buckle closures and suede footbed liners with direct-injection outdoor-ready outsoles for increased traction and durability. Anatomically shaped cork-latex footbed Upper: oiled nubuck leather Footbed lining: suede Sole: polyurethane (PU) Details: two straps, each with an adjustable metal pin buckle; two-component sole Made in Germany *these have been altered* one was/is a Sonora CT Birkenstock the other is a Sierra CT Birkenstock basically, one had a strap on the back and the other didn't but all sales were final and I didn't know what else to do I cut the strap off the back of the Sonora CT to make it match the Sierra CT please view photos. I've circled where the strap was cut off.