Women's Impact Pro Base Layer features a functional fit to hug the torso for a close fit under your cycling apparel. Integrating lightweight and flexible ARMA it offers a highly technical 3/4 length sleeve, fast-wicking protective cycling base layer, suitable for a variety of weather conditions. Just 4mm thick at its maximum and rated to EN1621-1 motorcycle standard, ARMA padding is capable of absorbing and safely dissipating up to 80% of impact energy, should the worst happen out on the bike. The shape of each pad has been carefully developed to ensure the best possible fit at each size point.