It's got a domed acrylic crystal face, leather-based strap, and a light-weight Develop that helps make this watch comfy wear throughout the day. Take into account: Acrylic crystal just isn't as scratch-resistant as sapphire or mineral crystal; the leather band might present wear more quickly than predicted. I requested at https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/