HDT Design Evolution N.A.T.O. Black + Orange + Black Stitching [22mm] Natural rubber coated Italian leather on the Nylon Base G10. The result is comfortable yet very chick and versatile design. Thickness has been kept to 1.5mm thick so you will not have to worry about the space between your spring bars and the watch casing. Strap Length(including buckle strap): approx 27cm Thickness: 1.5mm