Under armour womens heatgear armour ss topthe womens heatgear armour ss top uses heatgear armour which delivers an amazingly lightweight fit without sacrificing coverage or support the heatgear armour top features a light but locked in pinholes mesh that delivers superior breathability a signature moisture transport system wicks sweat to keep you dry featuresmaterial polyesterelastanefitted next to skin without the squeezelight but locked in pinhole mesh delivers superior breathability