The new Glycerin 20 uses Brooks’ softest cushioning material, nitrogen-infused DNA LOFT v3, which is lightweight, responsive and durable while delivering plush comfort. The plush, breathable upper is made from ultra-soft materials to deliver exceptional comfort and a secure fit with 3D Fit Print providing strategically-placed structure that won't rub. The Glycerin also features an Ortholite sockliner for superb step-in comfort while a new outsole design delivers smoother and more stable transitions from heel to toe-off. The Glycerin 20 is a great shoe for runners who are looking for supreme comfort and distraction-free miles! Runners looking for a soft shoe for recovery runs or long runs will also benefit from the level of cushioning this shoe provides.