LIGHTWEIGHT TRAINER FOR BUILDING SPEED AND OUTRACING COMPETITION. Designed to make fast go faster, the Nike Zoom Gravity is built to take you from quick tempo runs to winning races. Snappy forefoot propulsion and grippy, multi-surface traction combine to maximise your stride. Fast feel: responsive Zoom Air unit in the forefoot gives you that propulsive, snappy feeling, while outsole rubber directly underneath creates a springy sensation like you're popping off the ground. Soft and stable cushioning: lifted height along the midsole makes room for more cushioning inside. Dual-density foam with a soft core in a firm carrier delivers a comfortable, stable ride. More details: outsole rubber on the heel provides durability and traction on all surfaces, higher heel with foam on the sides creates a cupping sensation and adds stability, and a thin, minimalist collar curves upward slightly for sharp style.Upper - Textile, Lining and Sock - Textile, Sole - Other Materials.