NSF Walker Asymmetrical Zip Hoodie in Gray. - size L (also in XS) NSF Walker Asymmetrical Zip Hoodie in Gray. - size L (also in XS) 64% cotton 32% spandex 4% rayon. Front two-way zipper closure. Drawstring hood. Side pockets. Made in USA. NSF-WK61. 2420-SHF. Based out of California, NSF has caught the eye of many. With their clean design and boyish charm, NSF is recognized for its relaxed, modern style looks.