Along with support and balance, the Brooks Adrenaline GTS 15 responds to your run with the adaptive cushioning of a BioMoGo DNA midsole, while the full length segmented Crash Pad provides an ultrasmooth heel to toe transition. Please note: The Adrenaline GTS 15 runs slightly smaller than previous models if you are between sizes, Brooks recommends choosing 12 size up. . Midsole drop: 12 mm ideal for flat to medium arches. Support shoe: Ideal for runners with moderate pronation. Progressive Diagonal Rollbar for added control and stability. BioMoGo DNA midsole provides long lasting adaptive cushioning and custom comfort. DNA midsole adapts to runners weight, gait, and pace, and running surface for customized cushioning that adds spring to your step. S 257 Cushsole provides excellent return energy and cushioning with every stride. Full length Segmented Crash Pad provides amazing cushioning and smooth heel to toe transition with independent fully integrated shock absorbers shaped like a caterpillar. Omega Flex Grooves provide stability and flexibility. DRB Accel: Provides torsional rigidity and support to midfoot. HPR Plus abrasion resistant rubber outsole for high durability blown rubber forefoot Omni grooves. Flextra strategically placed in the forefoot outsole to provide tuned flexibility based on gender and weight. Mesh upper and lining for moisture management and breathability synthetic overlay materials for support and durability Profile sockliner internal support saddle.