Synthetic-MeshImportedRubber soleSurface: Road. Differential: 10 mm. Heel/Toe: 21 mm/11 mm Lightweight mesh and synthetic upper with an athletic-inspired silhouette. Seamless construction in the forefoot helps eliminate the likelihood of irritation. Features refined heel detailing for a more versatile look. Lace-up closure. Padded tongue and collar. Breathable fabric lining. Ortholite? sockliner provides excellent support and reliable cushioning for long-lasting wear. Lightweight EVA midsole delivers featherweight cushiThe ASICS? GEL-Quantum 90 running shoe has a versatile look that lets you wear it for casual occasions while still providing superior support and cushioning to keep you moving at your best mile after mile.Predecessor: GEL-Quantum 360.Support Type: Neutral.Cushioning: Lightweight, flexible response.