- In most birds, down is a softer layer of feathers similar to a fine mammalian fur that lies below their external layer of bristly feathers. It's a light material that also has excellent insulation properties. These properties ensure that packing it closely together results in surprisingly effective heat trapping. Down products are rated for insulation by a term called fill power--cubic centimeters to grams (or cubic inches to ounces)--with the upper ranges trapping heat even in extreme sub-zero weather.
- Higher fill power feather beds are significantly softer and warmer than lower ones, and more expensive. A fill power of more than 600 cubic inches per ounce is an extraordinarily comfortable mattress topper. The thread count of the fabric should also be taken into account. Feather beds have a higher thread count than most sheets and covers because they need to be a tighter fit around the packed-in down and feathers. Most feather beds have a thread count around 300 or less, but higher-end luxury products can offer 500 or more.
- The most significant issue that most people face with their feather beds is a severe allergic reaction. Even if an instantaneous reaction isn't felt in the store, it's possible that one will develop over time with constant contact with the mattress cover. Make sure that a return policy is in place until you know for sure that your histamine system can handle it.
- Older feather beds may have luxury cachet, but they don't have the useful structural features that modern ones do. Often, feather beds are passed down through families for years. These relics, while having sentimental value, are often not terribly comfortable. The feathers shift around, clustering around edges, creating pockets of irritating cool air on the cover. Modern feather beds, by comparison, often have special structures that keep the down and feathers stuck in place. They have much higher and more comfortable thread counts, along with removable washable coverlets.
- Feather beds provide a warmer, more comfortable sleep for people who prefer soft beds. Smaller feather bed covers are perfect for couples who can't agree on mattress firmness. For people with allergies, there are hypoallergenic synthetic feather bed alternatives, many of which are machine washable. The increased insulation can make it possible to turn down the thermostat and save money on heating bills.
