Sleeping Bag Navy Blue and GrayDetails of Sleeping Bag Navy Blue and Gray Features FOR COLD NIGHTS: Not every adventure requires waking up from the cold; the moisture proof shell, the soft and skin friendly pongee polyester liner, and the fluffy, polyester wadding offer excellent warmth and comfort throughout the night DETAILS MATTER A LOT: Two way auto lock zippers provide flexibility and a boost in durability so that it doesnt unzip itself while you're sleeping; the hook and loop