Women’s size 9 Gel Nimbus 24. Exclusively worn indoors on treadmill. Like new. Smoke and pet free home From the website: Engineered mesh upper: Wraps the foot with a soft feel while improving breathability. ASICS LITE rubber is lighter, stronger, and more sustainable than standard outsole rubbers: AHAR outsole rubber: Improves durability. Rearfoot and Forefoot GEL Technology Cushioning System: Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle. Trusstic System technology: Reduces the weight of the sole unit while retaining the structural integrity of the shoe.