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Face it, folks: Summer hiking season is winding down. But in mild climates, the Kayu 30°F will keep you warm into the cooler nights of fall. The bag’s 20-denier ripstop nylon shell is DWR-treated, and it has an even more robust 40-denier nylon footbox, which testers say holds up well to rough conditions. “When we bivvied below 14,259-foot Moosejaw’s Mountain Steals, making it $227.42.