It's a domed acrylic crystal encounter, leather-based strap, and a lightweight Construct that tends to make this observe at ease don throughout the day. Bear in mind: Acrylic crystal is not as scratch-resistant as sapphire or mineral crystal; the leather band could demonstrate put on more quickly than envisioned. Observe: https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/