Suitable for work boots and both casual and athletic shoes, Ergo Shield Insoles are firm, yet flexible, with shock-absorbing gel that softens impact of each step to alleviate pain. Each insole incorporates dual-layer VCT® Variable Cushioning Technology consisting of micro-cellular foam formulation. Ergonomic heel cradle and built-in arch support optimize structure and stability of foot to help relieve pain and prevent injuries, while anti-microbial top fabric minimizes heat and friction.