NIKE Premium Women's Convertible Running Jacket DWR (Durable Water Repellent) Treatment - This fabric treatment preserves the garment's imperviousness to light rain. Lined, Adjustable Mock Neck - Zips up to the chin to retain warmth and keep out inclement weather. Zip-Off Sleeves - Epitomising the notion of versatility, this feature allows the garment to convert into a gilet in hotter weather. Perforations - Positioned across the yoke, back and under the arms, allowing air to permeate the garment and regulate temperature across critical heat zones. Reflective Components - Preserve the wearer's visibility in poor light.