The new Glycerin 19, packed with DNA LOFT cushioning throughout the full-length of the midsole, delivers a softer experience from heel to toe than ever before. And, it also comes with the option of GuideRails technology for whole-body support. DNA LOFT cushioning for ultimate softness Super soft comfort The right balance of foam, air and rubber deliver a soft comfortable run. Lightweight Extra air in the midsole means the cushioning won’t weigh you down. Durable Added rubber increases durability, so you’ll feel the same softness every time you lace up.