Features Made of silicon: High cushioning coefficient, Next to nature.Shock absorption and energy return.Long functional life. Anatomical and streamlined shape:Ensures better weight distribution.Reduces peak loading.Helps correct body alignment.Lessens the strain on ligaments, muscles and Achilles tandon. Extra soft spot:Reduces pain immediately in calcaneal spur problem.Can easily be put into shoes, Convenient and comfortable Non Cellular:Has a long functional life.Odourless. Easy to clean and maintain.