Nike Therma-FIT Swift Women's Running Vest If you're starting to question whether it's too chilly or breezy to go for a run, step outside in this vest. You won't be fighting the cold alone, Therma-FIT technology helps to keep your centre warm, whilst protecting you from the elements with heat-regulating abilities. Made using Nike's Therma-FIT technology, the vest has excellent abilities to help manage your body's natural heat, helping to keep you warm during cold-weather conditions, whilst also providing you with wind-resistant protection. The tiny spaces between fibres trap air within the material while blocking wind from the outside to provide the utmost comfort for your next run. Additionally, the vest has a drop-tail design, which extends the coverage on your backside, giving you extra levels of warmth. Ensuring a customisable fit, the bungee cord adjustment at the waist, as well as a full-length front zip for airflow control and an easy on or off. Two zippered si