ASICS Women's Gel-Quantum 180 TR Cross-Trainer Shoe 100% Synthetic Imported Synthetic sole AHAR: Acronym for ASICS High Abrasion Rubber. Placed in critical areas of the outsole for exceptional durability. Truss tic 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