This is the OD19, Olive Drab 19mm adjustable watch strap. The material is very soft and flexible and is thinner than The Original strap. Being thinner, it works well with dress or non-dive watches, but I also find that it works well with my Seiko 6105! These straps are made from a soft military grade elastic and feature the same 316 stainless hardware as other TWS straps. Just as with all Watch Steward straps, these are adjustable to 6-8" wrist sizes.