Description of Helly Hansen Viper CIS Jacket All-season weather protection and versatility. The wintersports-focused Viper CIS comes with a removable insulator the extends the right level of comfort from early winter through late spring. Features: 100% polyamide Snap-away powder skirt Multiple pockets Pit zip venting Attached hood with stretch panels CIS: removable insulator with Helly WarmCore insulation Snap-up hem drawcord adjustment 2-Layer waterproof breathable protection One-hand hood adjustment