Brooks Women's Launch Running Shoes (7 B(M) US, Caribbean/Silver/Fiery Coral) Synthetic Lightweight, breathable air mesh upper with synthetic overlays HydroFlow fluid units in the rearfoot cushion and absorb shock Full-length, energy-returning S-257 midsole provides excellent flexibility and long-lasting cushioning Cushioned, full-length BioMoGo midsole is 100% biodegradable Universal Platform shoe last built for runners with a medium to high arch HPR Plus abrasion-resistant rubber outsole