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Zappos.com is proud to offer the Brooks - Trance 9 (Silver/Pavement/Cockatoo/Charcoal) - Footwear: 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. Midsole and outsole components are engineered to set the foot in an efficient, balanced position from heel strike to toe-off, offering maximum stability and responsiveness. ; HPR Plus technology. A highly durable, abrasion-resistant rubber outsole compound that wears longer. ; Blown rubber outsole. ; 9.00 oz. ; Product measurements were taken using size 6.5. Please note that measurements may vary by size.