These Knee Pads don't slip down the leg in use, and basically stay in place when getting up and down. The flexible joint is the key to not slipping down the leg.They cost about $25.00 and are practicable and useful for gardening, and any other vocation requiring the wearer to kneel. The padding is sufficient for any rough surface. I usually put them on when working in the garden and it is a joy to kneel down when required. These pads button on with a simple elastic strap. Dont' leave home with out a pair.
The common type usually available in stores is for all practical purposes is difficult to use, since they do not stay in place, when getting down and up and walking around. The common variety without the flexible joint costs about $7.00.