The Kelty Sine 35 Sleeping Bag is a lightweight three season sleeping bag intended for backcountry use. The Arc Zipper System is engineered for a smooth in and out, and along with the secondary footbox zipper creates a convenient venting option. Hydrophobic and quick-drying 800 fill power DriDown™ will help you stay warm and cozy, even if exposed to some moisture. This mummy bag is Kelty Built with a thermal-comfort hood, a draft tube that curves along the zipper and extra down loft for heat retention and remarkable comfort. Not including this bag on your next adventure could be considered a Sine of Madness. Probably not the good kind, though.
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