This is an awsome down bag. It is very warm and not too cramped inside. I do tend to be a cold sleeper, but I have slept comfertably into the lower twenties with only a light base layer. I have found this bag to be too warm for milder nights, and have had problems with sweat collecting in the bag even with the side zip opened for ventilation. I find it to be more of an pain than a problem, and the bag even when mildly damp has always kept me warm. I have found that as long as the night time temps are below 35 degrees I am fine, but any warmer than that and this is just more bag than I will need. Marmot sleeping bags are very well built, and you won't be disappointed in the craftsmanship. I have not had any problems with loosing down, nor have I noticed any loss in loft. I would recomend this bag to anyone for a fall/spring bag, and for winter in mild climates.