These gel insoles are covered in tiny pyramid shaped bumps all around the heel and ball of foot area. These act as tiny little shock absorbers, reducing joint pain and stress. When you walk or run the pyramid bumps absorb the impact, they then spring back into shape and provide an extra bit of energy, like an air bubble you see in running shoes. If you’re on your feet all day working, using these gel insoles will make your shoes comfortable again and put that spring back into your step. The gel insoles are covered on one side with a grey antibacterial cloth which will control odour, the insoles can also be washed by hand. Available in 2 sizes: Small = UK 3 to 6,Medium 6 to 10, Large = UK 6 to 11 Weak and fallen arches can cause knee, hip and back pain. These insoles have a 1 cm high arch support. Wearing the insoles daily will support your arches, reducing the chance of this happening to you. The insoles can be cut with sharp scissors for a precise shoe fit. There are guidelines on the gel bit of the insoles but for a more accurate fit it's better to use your old insoles as a guide and cut around them.