Birkenstock Gizeh Birko-Flor Women's Thong 'Narrow Width' Sandals, Stone Birko-Flor - Made of acrylic and polyamide felt fibers, this material is a soft fabric with a smooth leather-like finish. Imported Rubber sole Platform measures approximately .50" Birkenstock Gizeh Birko-Flor Women's Thong Sandals; Narrow Width. Upper material: Birko-Flor - Made of acrylic and polyamide felt fibers, this material is a soft fabric with a smooth leather-like finish. Footbed: The original Birkenstock footbed - Featuring pronounced arch support, deep heel cup, and roomy toe box. Footbed molds and shapes to your foot. Sole material: EVA - Flexible, lightweight, durable and shock absorbing. **** Newly updated model (latest production); Gizeh may now ship in newly updated Birkenstock shoe box (new blue design with handy size measuring guide printed on inside of shoe box). Sandals may now also come with black (not yellow) lettering (black printed logo and size information printed on footbed). ****