Nike Men's Therma-FIT Vest Made with soft fabric, the Nike Therma Victory Vest helps keep your core warm in cold conditions. The sleeveless design and 1/2-length zipper make it easy to take the vest on and off in changing weather. Nike Therma fabric helps manage your body's natural heat to keep you warm and performance high when temperatures are low. The fuzzy fabric provides extra softness and warmth. Standard fit for a relaxed, easy feel. 100% Polyester.