The Beast '20 features our new GuideRails, a holistic support system, this trusted stability keeps you moving comfortably by keeping the excess movement in check. In the addition to GuideRails, the Beast '20 includes a full-length Segmented Crash Pad that accommodates the foot landing and delivers a smooth heel-to-toe transition. The midsole contains one of our softest cushion material, BioMoGo DNA plus the Ultimate Sockliner that enhances comfort creates a comfortable feel. Enjoy the enhanced fit of the Beast '20 with our Engineered mesh upper and conformable embroidered saddle.