LAYERABLE HEAT WITHOUT UNNECESSARY WEIGHT. With added protection such as thumb holes and a stand-up collar, the Nike Sphere ladies top is a perfect layer for running in cold weather. The warm knit material looks and feels soft. The Nike Therma-Sphere material provides thermal insulation at low weight. Dri-FIT technology keeps you dry and comfortable so you stay focused. Sleeve mittens provide optional warmth for your hands. The high collar can be zipped to the top to keep warm, or folded down for ventilation.