Our Lulu sandals with a sleek design feature a timeless slightly padded triangular upper made of leather, as well as our legendary ergonomic Microwobbleboard™ midsole. The perfect choice if you want to stick to just one new pair of shoes for the season. Upper Material: Leather Lining: Fabric Closure: No Closure Sole: Non-slip Rubber Sole Technology: Standard Microwobbleboard. Microwobbleboard standard Slip-resistant rubber Padded microfibre.