NIKE Lady Air Alvord 10 GoreTex Trail Running Shoes GORE-TEX - A waterproof and breathable upper designed to protect the foot during extreme weather conditions. Sticky Rubber Outsole - A grippy rubber that ensures you have fantastic grip and traction on all surfaces. Nike Air Cushioning - A technology that provides both great comfort and stability. BRS 1000 Rubber - Carbon rubber outsole for great durability in those areas that get worn very quickly. Padded Heel - Nike Air sockliner and heel unit provide support towards the back of the foot, great for trail running.