What Happens If You Put A Sleeping Bag In The Dryer?
If you put a sleeping bag in the dryer, especially on high heat, it can damage the insulation and fabric of the sleeping bag. The heat can melt the synthetic fibers and cause clumping or shifting of the down insulation, reducing its effectiveness. It is best to air dry sleeping bags or use the lowest heat setting on the dryer with tennis balls or dryer balls to break up any clumps.