From the HIRSCH Nature Collection is Stone, an animal-free vegan line made from renewable materials. The Stone gray performance strap is a truly unique, luxurious piece created by HIRSCH. A top layer crafted from razor-thin split shale with a special surface coating is layered overtop a premium caoutchouc rubber core. Caoutchouc is a revolutionary material for strap function - it's water resistant up to 300 meters, hypoallergenic, resists wear & tear and has an integrated moisture and thermoregulation system. Equipped with the HIRSCH quick release spring bar system to make changing your strap quick and easy! *In stock, most products ship same or next business day* Details From the HIRSCH Performance Collection: Stone is a bold and unique leather alternative that will standout on your wrist! Hirsch's new Nature Collection focuses on leather alternatives, including vegan friendly renewable natural materials. The top layer is crafted from razor-thin split shale with a special surface coating to create a smooth semi-matte finish and provide additional sturdiness. The shale upper is layered overtop a premium caoutchouc rubber core. The soft caoutchouc core is flexible, adapting to the shape of the wrist and the groove structure on the underside ensures humidity and water are quickly released, creating an immediate drying effect. HIRSCH Stone includes an integrated high-quality Hirsch black stainless steel folding buckle for convenience and ease in taking off your watch. Upper Material: Split Shale Stone Core Material: Caoutchouc Rubber Upper Color: Gray Core Color: Black Stitching: None Finish: Semi-Matte Length: 7.87" (120mm x 80mm) Class: Men's Regular Waterproof: Y - 300 meters Hypoallergenic: Yes Sizing Strap Size Watch End Width Buckle Size Buckle End Width Thickness Watch End - Buckle End 20mm 18mm 5.5 - 2.8mm 22mm 20mm 6.0 - 3.0mm Sizing Mobile Strap Size Watch End Width Buckle Size Buckle End Width 20mm 18mm 22mm 20mm Thickness Watch End - Buckle End 20mm Strap: 5.5 - 2.8mm 22mm Strap: 6.0 - 3.0mm