Nike polyfill vests blacktransition seasons in lightweight warmththe nike polyfill vests allow you to keep on running through the seasons with low profile insulation and water repellence ensuring the elements are kept at bay so you can focus on your training or competitive race lightweight and durable with ripstop fabric for wind and water resistance these polyfill nike running vests make a perfect layering piece for any aspiring athetebenefits durable ripstop fabric for wind and