It's very comfortable to use. If you get pinching on the back of your leg, you have the straps too tight, just loosen them slightly.
They're very comfortable on the knees, and that's what I'm trying to protect! I got them mainly because many reviews said that they're awesome. And they are!
I was amazed at how comfortable they were and they never dropped down onto my calves or affected my circulation in any way. They worked well and were totally comfortable.
First day and I like them, no more pain on the back of my knees.
Highly recommend them! Pads are very comfortable and offer the protection that my knees need from constantly being on my knees when doing garden work.