I am a first-time Birkenstock buyer, so I bought these more affordable non-leather versions on Posh. Unfortunately, they are too big and I need to go down a size. I did some research and I believe the style is Catalina Soft. Good condition with some wear to the footbeds and lining. They appear to be made of Birko-Flor, which is Birkenstock's vegan alternative to leather, and Birko-Felt for the lining.