Wms Helium Jacket - Packable LightweightCompact 2.5 layer jacket - stretch fabric on hem & arm holes for an athletic fit,Compact 2.5-Layer waterproof/breathable fabric with stretch panels on hem and armholes,Athletic fit,Asymmetric front zipper,Waterproof stretch chin guard,Slimline inner storm flap with wrapover zip guard,Reflective film strips on front/back - dots on cuffs,Softshell hem and cuff panels for athletic fit,Complete with compact stuff sack,Rear zipped security pocket.ConstructionNylon 100%.Technical aspectsWaterproofness: 15000,Breathability: 15000.Fabrics & TechnologiesYKK®.