Like your own bed in the backcountry! Big Agnes' Doublewide Series eliminates the need to zip two bags together so there's nothing keeping you apart from your cuddle bug in your tent, van, or wherever you need a super comfy bed. The much improved Sentinel 30deg is insulated with 650 fill DownTek; a water-repellent down insulation that repels water while maintaining insulating properties and loft for a cozy, warm sleep experience.