The Evolution Model is available in four sizes. It is one of the strongest and most stable walkers, using 1-1/8″ cold rolled steel tubing.  It has strong 1″ tubing on the handles, and every fastener is stainless steel or plated against corrosion. The frame is powder-coated with UV protection against fading and all plastic components are molded utilizing the toughest plastice capable of withstangin temperatures up to -40 C.