To manufacture this leather seat for Triumph Bonneville Bobber 1200 (2017-...), we use an high quality double-tanned leather (chrome and natural) that will get a certain patina over the time, depending on how you care after it. The foams are isolated from the leather cover by a plastic cover so it remains waterproof. 

This seat comes with a leather care cream. Depending on the weather conditions of your country, an intensive exposure to the sunlight and rain will lead it to get a patina. It requires to be regularly maintain using leather cream and grease.