Crazy Comfy Mystery Sandals Woven Upper Rubber Sole See Measurements to Size EUC

These are mystery sandals. No branding information. No materials information. They are woven of some type of straw-like material and have rubber bottoms. They are NWOT. I slipped them on (thinking I would keep them) and they are really comfy but too large for me. The size indicates EU 39-40 which equates to US 8.5-9.5.