Sleeping out in the summer can be cool and comfy, unless youre having a sweat-attack in your bag. Thanks to a zippered foot vent and a two-way, hip-length zipper in the Kelty Light Year 40-Degree Down Sleeping Bag, you can let cool air in before you get all hot and clammy. Kelty also made this mummy bag with 650-fill down, so you can camp in the mountains without getting chilled. The Light Year 40 Degree Down Bags sculpted hood surrounds your noggin without making you feel claustrophobic. Down fill holds its loft season after season.