A knee pillow that is being used should be cleaned and in a good state, just like any other accessory commonly used. It is here that a cover for knee pillow comes in handy. In addition to an engaging outer shell, a high-quality cover offers high protection from dust, dirt, and even sweat and adds softness to the pillow. https://livepositively.com/the-essential-cover-for-knee-pillow-comfort-and-protection-combined/