They're supposedly for low-crawling over a long distance. Man, that fucks up yer knees and elbows like nobody's business. Trouble is, those pads don't work because unless you have 'em on tight enough to cut off your circulation, they just slide down and are generally annoying.
Having a pad on one knee is handy for when you need to kneel for a sec or two to read a map or whatnot, but other than that, they're worthless.
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