KIT watch cases are made of 100% premium natural wood. Our dial windows are made of sapphire crystal glass, which keeps the glass scratch resistant. All watches feature a Swiss quartz movement. The straps are made of Italian full grain leather and are easily interchangeable. Over time, you'll start to develop an intimate bond with your watch. The wood and leather absorbs oils from your skin giving it a unique and beautiful patina. They are lightweight and practical, designed to withstand the intensity of all of life's adventures.