The Boardwalk borrows the upper from our Salt Water Classic and combines it with our ultra-comfortable poly-urethane sole creating a stylish sandal that may very well be the most comfortable pair of sandals we have ever created for adults. • Genuine leather upper • Genuine leather insole • Rust-proof buckles • Water-friendly • Non-slip Poly Urethane sole for comfort and cushioning • Recyclable with excellent durability • Cleans easily with mild detergent and water See the second picture of the Classic (on the left) and Boardwalk (on the right) Saltwater Sandals, you can see the difference on the soles!