Not too warm and not too cold. At 30 degrees, the Big Agnes Gun Greek Sleeping Bag hits the sweet spot for temperature. The Gunn Creek uses 20 oz of Integrity insulation and only weighs a tad over 3 lbs. Like all Big Agnes Sleeping Bags, the Gunn Creek requires a pad. We recommend the Big Agnes Insulated Air Core Pad but any pad will do if it's the correct size. For the Regular get a 20 x 72 inch pad and for the long you''ll need a 20 x 78 inch pad.Insotect Tubic is a revolutionary tubular insulation system engineered to provide the maximum cubic loft for supreme thermal efficiency and user comfort. Through its innovative design and construction, Insotect Tubic delivers performance benefits that make gear significantly loftier, warmer more durable. Superior thermal efficiency the significant air space created by the DualVault and Vertical Thermal Channel delivers the best thermal efficiency.