STAY STEADY. STAY FOCUSED. Designed for optimal adaptability during cold-weather runs, the NikeLab Gyakusou AeroLoft Zip Off Men's Running Jacket features removable sleeves and a breathable down body. Ultimate Adaptability The jacket converts to a vest with the easy removal of the sleeves via QuickBurst ® zippers. A roomy zip pocket in back lets you store the sleeves while you stay running. Lightweight Warmth Nike AeroLoft technology integrates lightweight 800-fill goose down for insulation with strategically placed perforations throughout the body to help you maintain optimal performance in cold conditions without overheating. Total Cooling Stretchy woven panels on the arms feature Dri-FIT Technology to help keep you dry and comfortable, while the upper sleeve panels have lightweight Thermore ® fill for warmth. More Details Two-way front zip for custom cooling and fit Concealed zip hand pockets protect essentials Reflective elements stand out in low light Fabric: Body and sleeves: 100% polyester. Body fill: goose down. Sleeve fill: 100% polyester. Machine wash Imported Size and Fit Shown in size medium Model measurements: Arm length: 31"/Height: 6'2". About NikeLab Gyakusou: Running in Reverse Running is meditation. This principle drives Undercover founder Jun Takahashi as a designer and a runner. It also drives the latest NikeLab Gyakusou performance collection, designed to help athletes run distraction free. Fabric innovations, on-the-fly adaptability, packability, storage and weather protection let athletes maintain an uninhibited state of flow. Science begets style, and the runner's mind is free to focus on the road ahead.