The Brooks Glycerin 19 Men's Running Shoes include more of the DNA LOFT cushioning that has been engineered to provide you with a great luxurious feel underfoot but without losing the responsiveness you require and makes every transition from heel to toe soft and smooth.The DNA LOFT transition zone on the sole ensures the movement from heel to toe is a smooth one. There is a more adaptable fit in the upper, thanks to the 3D Stretch Print, for a seamless and custom made feel that will have you thinking the shoe has been made for you personally. The Glycerin 19 also includes an orthoLite sock liner for a more plush feel. Designed to compliment a neutral running gait and provide a high level of cushioning. Features DNA LOFT cushioning for a luxurious feel underfoot Super DNA midsole provides the ultimate adaptive cushioning New OrthoLite sock liner offers a more plush feel Rounded heel offers better alignment, minimizing stress on joints Ideal Pressure Zones evenly disperse impact for an effortless ride Conformable saddle construction gives your foot a snug fit 3-D Fit Stretch Print saddle and overlays on the upper add flexibility and structure Air mesh with 4-way stretch expands with the foot and gives maximum ventilation Brooks believe in their products giving you that Run Happy feeling. So, if you aren't satisfied within 90 days, you can return it to us for free. No mess, no fuss. Head back into store or send it back to us for a full refund.