Most back and knee pain can be corrected with realignment of the bones in the foot. Humans were meant to walk barefoot on soft ground, not wearing high heels, crocs, clogs, flip-flops or thongs! Because the liquid glycerin is self leveling your foot actually FLOATS on the Liquid Glycerin. The Glycerin is then evenly distributed under your feet filling in the low pressure points and taking pressure off the points of your foot that typically bears all of your body weight. The realignment of the bones and distribution of your body weight takes a tremendous amount of pressure off of your knees and back. Our liquid gel insoles also work with acupressure points on the foot providing natural foot pain relief. Within 2 to 3 days you will see a dramatic difference in lower back ache and knee pain.