The straps are lined with Black Zermatt leather from Haas tannery. This full-grain leather was specially developed for use as a lining material. It is soft to the touch and comfortable even after hours of wear. The leather is water- and sweat-resistant and works well even in hot and humid climate such as Singapore. The leather is scratch-resistant and able to withstand years of wear and use. Finally, the co-branded logo and strap sizing information are debossed into the Zermatt leather for ease of reference.