Jack wolfskin cumulus mens jacket this jack wolfskin cumulus mens jacket is a versatile synthetic fibre jacket that is ideal as a layer of insulation in a layering system but can also be worn on its own the lightweight windproof outer material allows the exceptional warm synthetic loose fibrefill insulation to its full loft two zipped side pockets provide secure storage for all your outdoor accessories jack wolfskin branding provides a great look that also offers instant brand recognition