When the cold sets in, you can set out in the Nike Sphere Half-Zip Running Top. The Sphere lining protects you from the cold, holding heat in while allowing for moisture management. When the asymmetrical zipper is unzipped, a gusset provides extra warmth. Thumbholes provide extra warmth and comfort. Upper body: Dri-FITŪ 86% polyester/14% spandex. Lower body: Dri-FITŪ 88% UV-protective polyester/12% spandex. Imported.