Osprey Four Season Insulation Kit

Keep water flowing in cold winter months and cool in the heat of the summer—this four-season insulated kit is ideal no matter the season. Featuring closed-cell foam, a heat-reflective coating, removable bite valve sleeve and easy-carry attachment loops. Fits reservoirs up to 3 litres. 
 
Features:

• Heat-reflective, closed-cell foam sleeve offers maximum insulation
• Tailored insulated reservoir sleeve with attachment loops
• Insulated hose protected from direct sunlight
• Zippered bite valve insulation sleeve helps keep mouthpiece free of ice
• Removable bite valve sleeve for summer use
• Reservoir must be purchased separately