It's a domed acrylic crystal face, leather-based strap, and a light-weight Establish that can make this check out at ease don throughout the day. Keep in mind: Acrylic crystal is not as scratch-resistant as sapphire or mineral crystal; the leather-based band may possibly display put on more rapidly than anticipated. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/