Bering Watch Ultra Slim 17031-000. With just a few millimetres in thickness the Ultra Slim is our thinnest watch yet and one of the slimmest watches on the market. High quality sapphire crystal protects the dial against scratches. The classic Ultra Slim 4.8 feels very comfortable on the wrist with its woven milanese strap. The Ultra Slim Link features strong stainless steel link straps.