The Superior Comfort Knee Pillow.
No other knee pillow has the degree of adjustability and support that this one has. Unlike other pillows with only one position, this pillow's patented shape provides an almost infinite variety of support positions. The elliptical wedge rotates easily--lay it flat for low elevation, roll it all the way up for higher elevation, or set it in between. It also has an internal air piston so you can change its firmness with the simple turn of a knob--increasing or decreasing the pillow height up to 2 full inches for truly customized support. The gentle curves of the wedge provide exceptional support without pressure points or angles, for maximum comfort that won't inhibit circulation. The frame is hollow cell polypropylene that is strong but not bulky, and the pillow is aircraft-grade foam that is soft yet supportive. The 100% cotton cover is machine washable for easy cleaning, and unlike some gimmick-laden support pillows, there are no batteries to replace or cords to plug in. It can even be taken with you when traveling. 13" W x 22 3/4" L x 9" D. (4 lbs.)