DESC: The Marmot Pounder Plus 25F PrimaLoft sleeping bag is a lightweight weather-resistant 3-season bag that's so durable you can use it without a tent. Crazy. The Pounder's A-Flex construction keeps warm air from escaping and moisture from intruding. Just your Marmot PrimaLoft gloves, the left-zip Pounder Plus keeps you warm in wet, cold conditions, without bulking up on weight or mass. If you're alpine camping, where the weather can change in an instant, the Pounder Plus is the perfect bag.