FitFlop's minimalist Lulu sandals feature a timeless triangular vamp, softly padded leather uppers, and FitFlop's legendary ergonomic Microwobbleboard-middenzool design. They are a classic choice if you want to buy a new pair every season. Upper Material: Leather. Lining Material: Fabric. Sole Material: Rubber. Closure/Fastening: Slip-On. Features: Comfort, Slip Resistant, Microwobbleboard. Heel Type: Wedge. Heel Height: Low (2.5-4.9cm). Sandal Style: Toe Post.