How do you get them? A pad of Post-It notes and a utility knife. I started by practicing cutting just the top Post-It without cutting the 2nd sheet. Then cutting two sheets without nicking the 3rd. Then 4 sheets without nicking the 5th. I got all the way up to 9. That's acuity to pressure. Give it a try with a utility knife, a fresh blade, and a pad of paper and you'll see exactly what I mean. I'm 100% serious; try it before your next shave. It'll only take 5 minutes, and by the time you get to 3 sheets your acuity to pressure/sensation while shaving will have at least doubled.
This reminds me of shaving with my glow-in-the-dark slant. Twisted blade with low rigidity that shaves the bees’ knees at a shallow enough angle and snaps back from every hair into the skin when used steeply.