NSF Julian Snap Side Warm Up Pant in Army. - size S (also in XS,M,L) NSF Julian Snap Side Warm Up Pant in Army. - size S (also in XS,M,L) Cotton blend. Elasticized drawstring waist. Side snap button closures. Back welt pockets. 17 at the knee narrows to 13 at the leg opening. Made in USA. NSF-WP115. 9322 CANRPS19D2. 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.