Fabric,ManmadeImportedRubber soleSurface: Road. Differential: 10 mm. Heel/Toe: 22 mm/12 mm Lightweight mesh and synthetic upper with an athletic-inspired silhouette. Seamless construction in the forefoot helps eliminate the likelihood of irritation. Lace-up closure. Padded tongue and collar. Soft fabric lining. Ortholite? insole offers exceptional underfoot support and moisture-managing properties. Solyte? midsole delivers featherweight cushioning and long-lasting durability. Forefoot and rearfoot GEL? cushioninThe ASICS? GEL-Quantum 180 4 running shoe gives you the power and supportive comfort to complete your run or training time with total confidence.Predecessor: GEL-Quantum 180 3.Support Type: Neutral.Cushioning: Lightweight, flexible response.