Lightweight, Packable Weather ProtectionKey Features:Lightweight, compact, waterproof and breathable ExoShell20ST™ fabric with built in stretch,Race number visibility,Full length front zip with internal storm flap,Fully seam sealed for waterproof protection,Reflective trims and prints,Tiny pack size, stuff sack included,A real life invisible force field.ConstructionNylon 100%.Technical aspectsWaterproofness: 15000,Breathability: 20000.