Run your route day or night. This reflective vest is packed with synthetic insulation to help keep your core warm mile after mile. Its classic fit makes it easy to layer over your go-to running top without unnecessary bulk. Innovative Warmth:Nike Therma-FIT ADV technology combines heat-regulating fabric with advanced engineering and features to help keep you warm in cold-weather conditions. Lightweight insulation throughout helps keep your core temperature comfortable. Built to Layer:Smooth woven lining makes it easy to layer over other garments. More Benefits: Full-zip design lets you adjust your coverage easily. Zippered pockets secure your running essentials. Product Details:Reflective material. Not intended for use as Personal Protective Equipment (PPE). Elastic at hem. Body:100% nylon. Lining/Fill:100% polyester. Do not wash. Imported. Style: IM6278; Color: Reflect Silver; Size: M; Gender: Male; Age Group: Adult | Nike Men's Therma-FIT ADV Reflective Running Vest in Grey, Size: Medium | IM6278-027