The SoftSil liner, produced with OptiSil, ALPS® innovative white silicone, offers a perfect balance between compactness and flexibility, granting patients the highest possible levels of comfort, control and stability; the Pro-Fit liner, produced with OptiGel, ALPS® innovative white gel, ensures excellent conformability to the residual limb and allows the user to experience a highly secure fit, resulting in enhanced control, comfort, and safety.