Tissot Chrono XL Collection Gents Chrono XL Classic T-Sport Watch With A Grey Stainless Steel Strap, Blue Coloured Dial & Date Window. The Tissot Chrono XL is one of the largest chronographs (45mm) in the Tissot collection. The Tissot Chrono XL Classic is a great watch for those looking for a sporty and elegant chronograph, with Swiss technology at an unbeatable price. Descending from the Tissot Chrono XL collection, the Gent XL offers a wide range of references letting everyone pick which belongs best to their wrist. Whether in line with current trends or of a more classical taste, the Tissot Gent XL will know how to seduce. Water Resistance All Tissot watch cases undergo several tests, including a water resistance check. Tissot tests the watch's ability to resist impacts and pressure, as well as the penetration of liquids, gas and dust by replicating the real-life conditions in which the watch may find itself. Sapphire Crystal Glass A sapphire crystal gives a watch the following properties: extremely high resistance to impact and superior screen and hand readability thanks to its transparency. Because it is the strongest material after diamonds, it is used in fine timepieces for its anti-scratch prowess. Sapphire crystals can take many forms and give the watch a variety of looks: flat, domed, concave or ground.