ASICS Women's Gel-Quantum 180 Tr Running Shoe 100% Synthetic Imported Rubber sole Ahar plus outsole: strategically positioned in critical areas of the outsole, this exceptionally durable compound is 50% more durable than standard Asics high abrasion rubber Trusstic system technology: reduces the weight of the sole unit while retaining the structural integrity of the shoe Solyte midsole material: a lighter weight midsole compound than asics' standard Eva and speva. Also features enhanced cushioning and durability Rear foot and forefoot gel cushioning systems: attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle Synthetic leather and mesh upper: lightweight, comfortable and breathable, enhancing performance and fit