From website: Engineered knit upper: Offers a supportive and comfortable foothold.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.The sockliner's sustainable dyeing process helps reduce overall water usage by approx. 33% and carbo: Attenuates shock during impact and toe-off phases, and allows movement in multiple planes as the foot transitions through the gait cycle.FLYTEFOAM Technology: Provides lightweight cushioning.The upper's main material is designed with approx. 30% recycled polyester: Provides lightweight cushioning.Good used condition, bought new and wore about 10 times. Great shoes, just found ones I like better.