|Your nemesis - Expanded Metal Grating.|
|And his side-kick - Bar Grate.|
|Wurk Pads from the front.|
|Wurk Pads - the secret revealed.|
The key design element is that they use heavy duty clips that grab your pant legs and won't let go (well, unless you tell them to). So, wa-la! Nothing sneaking around behind the crook of your knees to bind-up and get all sweaty. Sweet! No sweat.
This can come in handy if you have big feet, too, as some over-the shoe knee pads just won't open-up far enough to slip over your work boots. I suppose that if you had to work for a stretch on your hiney, you could clip one to each cheek and give them some relief, too.
Knee pads aren't just for crawling around on the steel, either: the stage and shop floor can harbor small screws, nails, tacks, and other pebble-sized objects that can render your brain useless should you set your full weight down on them via your knee-cap, so put these in your PPE kit - and don't kowtow to anyone without them.
More info at: http://simplifiedsafety.com/store/wurk-pad-clip-on-strapless-knee-pads.html