Only worn a few times indoors on a treadmill. The women's Glycerin Max optimizes airy softness and electrifying responsiveness at every point of every step. How? Two types of nitrogen-infused cushioning, seamlessly tuned into one midsole. That’s running redefined. Sustainability 66.4 % Recycled materials in the upper Best For… Road Running Protective Cushioning Effortless Transitions Innovative Design Features Tuned cushion Ultimate protection Effortless transitions