Keep them in a daze as you zip by in these Brooks® running shoes. They won't know what hit 'em!Lightly padded collar.Fabric-lined with a removable profile sockliner.Full-length BioMogo midsole, the world's first-ever biodegradable midsole for running shoes.DRB® Accel technology.Shank-like thermoplastic device provides torsional rigidity to midfoot, enhancing support while allowing the heel and forefoot to act independently.Full-length S-257 Cushsole.Durable, energy-efficient midsole compound utilized as an insole board for even more cushioning and flexibility.Progressive Diagonal Rollbar® (PDRB®). Bio-mechanically engineered to allow for progressive pronation control and creates smoother transitions from the midstance phase to the propulsion phase.Rearfoot ST-XL and Forefoot *HydroFlow® technology. Dynamic viscous fluid units in the heel and forefoot to enhance midsole cushioning; attenuating shock with industry-leading dampening and comfort.e¹ rearfoot and e² forefoot polymers compounds on midsole/outsole that works with HydroFlow® and BioMogo to progressively dampen the forces of energy that occur during the contact phase as well as enhance resilience under the metatarsals, resulting in a more powerful propulsion.Universal Sprung Platform for a more natural foot feel.Strobel construction.Forefoot Stable Pod construction on outsole. ... read more