Used NB women 1080 B12 Running Shoes feature: Hypoknit upper designed to provide strategic areas of stretch and support Bootie upper construction hugs your foot for a snug, supportive fit Fresh Foam X midsole foam with approximately 3% bio-based content delivers our most cushioned Fresh Foam experience for incredible comfort. Bio-based content is made from renewable resources to help reduce our carbon footprint Synthetic lining Rubber outsole