Step-by-Step Guide to Washing and Drying a Down Underquilt
Investing in a high-quality down underquilt is one of the best decisions you can make for your hammock camping sleep system. The incredible warmth-to-weight ratio and compressibility of goose or duck down are entirely unmatched by synthetic alternatives. However, because these quilts are such a significant financial investment, many hammock campers are absolutely terrified of washing them. It is a common misconception that washing a down underquilt will ruin its insulating properties. In reality, the exact opposite is true. Over time, natural body oils, sweat, campfire smoke, dirt, and humidity seep through the nylon shell and coat the delicate down plumules. This grime causes the down clusters to stick together, severely compromising their ability to expand and trap the dead air space that keeps you warm. A proper wash will strip away this dirt, restore the down to its original fluffy glory, and fully revive your underquilt’s loft and temperature rating.
Before you even think about putting your underquilt near water, you must gather the correct supplies. The most critical rule of washing down gear is that you must never use standard household laundry detergent. Everyday detergents contain harsh chemicals, bleach, and artificial fragrances designed to strip grease and stains. If used on down, these chemicals will aggressively strip away the natural protective oils inherent to the feathers, leaving them dry, brittle, and prone to breaking. You must purchase a specialized down wash, such as Nikwax Down Wash Direct or Granger’s Down Wash. Additionally, you will need a few clean tennis balls or wool dryer balls, and access to a front-loading washing machine. You should strictly avoid top-loading washing machines with central agitators. The aggressive twisting motion of the plastic agitator can easily catch the lightweight nylon fabric and tear the delicate internal baffles that hold the down in place.
Once you have your down-specific detergent and a front-loading washer, it is time to prepare the underquilt. Start by thoroughly inspecting the quilt. Empty any attached pockets, zip up any zippers, and brush off any loose surface dirt or leaves. Most importantly, you need to unclip any carabiners and loosen all the shock cord suspension lines. If the shock cords are pulled tight, they can get snagged during the wash cycle. Place the underquilt gently into the washing machine. Add the precise amount of down wash recommended on the bottle for a single sleeping bag or quilt. Set your washing machine to a gentle or delicate cycle, and ensure the water temperature is set to cold or lukewarm. Never use hot water, as high temperatures can damage the synthetic nylon shell and compromise the durable water repellent coating on the fabric.
When the initial wash cycle is complete, do not immediately take the underquilt out. Down is incredibly absorbent, and a single rinse cycle is rarely enough to remove all the soapy residue. Run the underquilt through at least one, and preferably two, additional rinse cycles. If any detergent residue remains dried onto the feathers, the down will not loft correctly. After the final rinse, carefully remove the wet underquilt from the machine. Prepare yourself, because it will look like a disaster. The underquilt will be a heavy, flat, lumpy mess, and it will look as though all the down has completely vanished. Do not panic; this is perfectly normal. Because the down is fully saturated, it is exceptionally heavy. When lifting the underquilt, use both of your arms to scoop it up and support its entire weight from underneath. Never grab it by a single corner or edge and pull it out, as the sheer weight of the wet down can instantly rip the internal mesh baffles.
The drying process is arguably more important than the washing process, and it requires a significant amount of patience. Place the heavy, wet underquilt into a standard tumble dryer. This is where you must add your clean tennis balls or wool dryer balls into the drum with the quilt. Set the dryer to the absolute lowest heat setting available, or even a strictly air-dry tumble setting. High heat will permanently melt the nylon shell and scorch the down feathers. Turn the dryer on and let the balls bounce around. As they tumble, the tennis balls will repeatedly punch the underquilt, gently breaking apart the dense, wet clumps of down feathers.
Drying a down underquilt on low heat takes a very long time. You should expect this process to take anywhere from three to five hours. Every thirty to forty-five minutes, stop the dryer, take the underquilt out, and give it a vigorous shake. Inspect it with your hands, feeling for any thick, dense clumps of wet down hiding in the corners or along the baffle seams. If you find any clumps, gently massage and pull them apart with your fingers from the outside of the fabric. Place it back in the dryer and repeat this process until the underquilt feels completely dry to the touch. Once you think it is dry, put it back in for another thirty minutes just to be absolutely certain. Even a tiny amount of hidden moisture can lead to mold and mildew growth during storage.
Once the underquilt is entirely dry, you will notice that it looks incredibly puffy, often lofting up even higher than the day you bought it. To keep it in this pristine condition, you must practice proper storage. Never store your clean underquilt stuffed tightly into a compression sack or a small waterproof dry bag. Long-term compression will permanently crush the down feathers. Instead, store it loosely inside a large, breathable cotton storage sack, or simply hang it uncompressed over a wide hanger in a dry, climate-controlled closet. By taking the time to carefully wash and dry your down underquilt once every season or two, you will protect your investment, maintain its maximum warmth, and guarantee yourself a cozy, comfortable sleep for many years of hammock camping.