In the past I shied away from rubber/polyurethane straps cuz every time I would try a G-Shock or Swatch my skin would get irritated/rash. After recently purchasing a vintage Seiko (6458) that came with a OEM rubber strap, DB71AB, I tried wearing it thinking I would just switch to a NATO. It is totally comfortable! It is a Z style strap, 18mm. I has tried a Swiss Tropic but this Seiko is better. If all the newer Seiko rubber straps are like this it is very impressive, at least to this happy camper.