Sa S Tec® armour offers the best possible protection during a dynamic impact. The armour is made from a new polyurethane foam material, without a hard shell or edges, which surpasses the required values by 50%. The closed air cells function by means of progressive absorption: with a slowly occurring stressor, the material remains soft & flexible, whereas sudden impact will cause the protector&8217, s air cells to respond quickly with increased resilience, creating a protective shield where the rider needs it most. 100% Polyurethane