Slumberjack Telluride 30-Degree Sleeping Bag Shell Fabric: 100% Polyester Liner Fabric: 100% Polyester Insulation Type: 100% Polyester Fiber Imported Rectangular, 30 degree Fahrenheit sleeping bag with synthetic Slumberloft fill Single layer construction suitable for warmer conditions Draft tube to prevent heat loss and anti-snag zipper technology Zip Together feature allows two same-size rectangular bags to form a double-wide Polyester diamond ripstop shell; polyester taffeta liner