Under Armour Micro G Pulse TR Running Shoes Synthetic Breathable Mesh Upper - Allows air to fully permeate the shoe's interior, encouraging an environment that is cooler, drier and altogether more pleasant. Synthetic Overlays - Reinforce the shoe's structural integrity without adding undue weight. Slim, Athletic Cut - Reduces weight further by eliminating the bulk of additional fabrics. Micro G Midsole - Thin, light, super-responsive foam cushioning supports the wearer's stride and turns cushioned landings into explosive takeoffs. 4D Foam Sock Liner - Conforms to the wearer's foot to deliver a secure, customised and adaptive fit.