All good points here on avoiding razor burn, and I won't rehash any of them. One of the MAIN causes for MY razor burn was:

- Pressure (I was applying too much)
- Angle of Blade (it wasn't low enough)
- MOST IMPORTANTLY - The direction of growth!

I get my razor burn on either side of my neck, and I found that what I thought was cutting WITH the grain was actually cutting ACROSS and even AGAINST the grain on my neck!

That's because on my neck, the hair follicles are obviously having some kind of dyslexic party down there, and they're just sproating every which way but down! So when I tackle my neck, in addition to watching the PRESSURE and BLADE ANGLE, I actually change up the DIRECTION of my cutting on my first pass.

So where my first pass I may go North to South on 90% of my face, I suddenly may switch to an East to West on my neck! Again, that's all on the first pass. I find that with second and third passes, the hair is already initially cut pretty low, so it reduces the risk of razor burn on subsequent passes.

Hope that helps, because it was an awakening moment for me and transformed the comfort of my shaving.