The Montbell Down Hugger 900 #3 is a three-season sleeping bag with a comfort rating of 37.4°F / 3°C. There are five models in Montbell's Down Hugger 900 series (900 referring to the down's fill power i.e. loft) - #1 being the warmest bag with a comfort rating of 24.8°F / -4°C and #5 with a comfort