These socks are designed with Dyneema® fibers, an equivalent of Kevlar, providing a lightweight, high strength and high durability product. This provides a level 3 protection rating in EN 388 tests, to help reduce the risk of lower leg injuries a player may be exposed during games. With low moisture absorption, high permeability, and incredible softness; it is by far the most comfortable wrist protector on the market. It does not loosen or roll down during games. Approved by the NHL for use in all NHL sanctioned games.