This golf jacket will give you more warmth without adding weight or bulk. How does it work? We use hollow fibers, which trap heat but are lighter than solid fibers. It is rainproof, so it is suitable for any weather.UA Storm technology is water-repellent without compromising breathabilityMedium-weight knit fabric with a soft, brushed interior and smooth, quick-drying exterior4-way stretch fabric provides greater freedom of movement in all directionsWith a generous 1/2 zipper at the front, it's perfect for layering the lookFluorine-free water-repellent layer