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Granite Gear Aquatherm water bottle insulator.

• Granite Gear Aquatherm water bottle insulator.
• Insulated bag fits a 32-ounce Nalgene bottle (not included)
• Buckle closure with zippered stash
• Features half-inch foam and a reflective insulation material
• Prevent water from freezing in winter conditions and works great for keeping hot drinks hot and cold drinks cold