Italian Leather & Nylon One of our most exciting features is the innovative strap mechanism, making it easy to swap straps on a daily basis, transforming the watch in just a few seconds so you'll never need to tire of wearing the same shade or design day-in-day-out.The nylon top surface of the Classic straps, especially the lighter ones can become discoloured over time. You can wash it with warm water and soap or put it in a wash bag and then in the washing machine on the lowest temperature setting. It's been tried and tested and comes out looking like new!