I own several pairs of OluKai leather flip flop sandals and they have all been great. The leather is high quality and the arch support is very good for this type of footwear. The Alo blue model is sporty and comfortable . The sandals are stylish while being casual. They take a little break in time, but become very soft with a few wears. Olu Kai covers the insoles and the outsoles with leather, which adds a high-end touch to the shoes. The leather lined insole is soft on comfortable against bare feet. Other Olu Kai models I’ve owned have process to be durable as well; just be careful around salt water.
