ASICS Men's Gel-Quantum 180 TR Cross-Trainer Shoe 100% Synthetic Imported Rubber sole Shaft measures approximately 3.25" from arch Ahar: acronym for asics high abrasion rubber. Placed in critical areas of the outsole for exceptional durability. Trusstic system: 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. Rearfoot and forefoot gel cushioning systems: attenuates shock during impact and toe-off phases, and allows movement on multiple planes as the foot transitions through the gait cycle. Synthetic leather and mesh upper