Birkenstock Silver Sandals with Adjustable Straps

Birkenstock Silver 41 Narrow (I think they're narrow bc the foot on the footbed is colored in and per their website - that means narrow) The woman I purchased from advised me that they are leather straps, and it seems to be true. She only used them one spring/summer. The foot bed and soles are in good condition, in my opinion. They just need to be cleaned. Unfortunately, they're too small for me. I'm trying to sell to buy another pair, so please be fair as Poshmark takes a fee...