I agree with Cyberdemon, this is probably not modeled, but it should not be too complicated (unlike something like the Jawbone UP bands, where the pattern is fluctuating and wrapping around a curved surface).
I gave it a quick shot in SolidWorks but as I see now, it isn’t quite right. The way I have it, the long edges waver up and down, but it is straight in the rendering. I’d have to think a little more on how this actually could happen in 3d form, and maybe it isn’t possible to physically model it the way that the rendering appears (bump map magic).
- Base sketch (pink) and vertical drivers (blue)
- Pattered + mirrored base sketch – not really necessary except for planning.
- Two surface-lofts using the base sketch and vertical drivers.
- Linear-patterned and mirrored twice.