The SEABIRD flip flop sandal is handmade with the highest quality, softest, most pliable leather we can find. The upper, lining and insole (the part of the sole beneath your feet) are 100% leather and the outsole is rubber for easy grip at the pool, boating and any situation. These sandals feature our signature molded arch for ultimate comfort and support and our leathers are vegetable-tanned, the most sustainable method available, from tanneries gold-certified by the LWG (Leather Working Group). Our footwear is meant to be in your closet for a lifetime. Wear them forever, they only get better.