It's like walking on a big, puffy cloud. Breathable, flexible upper features innovative Nike Fuse technology and is constructed without stitching. Dual-durometer midsole/outsole features a soft, pliable Nike Solarsoft foam midsole optimal airflow and drainage. Nike Solarsoft foam in a harder durometer for durable traction. Blends Nike's innovative Fuse technology with the ultra-soft comfort of Solarsoft foam for maximum comfort and style.