Outerwear Magnum 45 Jacket w/Snaps-Yel-6X The Magnum 45 Jacket with Snaps has a stand-up collar for detachable hood 45HO. Tested to ASTM D6413 and ASTM F90. The Neese Magnum 45 series is a medium weight yet heavy-duty nylon fabric coated with strong and flexible neoprene to provide maximum cold weather flexibility with a high resistance to abrasion. All seams in the garment, except the hems, are to be sealed on the coated side of the fabric with a clear 7/8â wide PVC tape making the garment 100% waterproof.