A down comforter is ideal to sleep under since it provides warmth when chilly, and it's lightweight when hot. Costco is one store that carries a nice selection of down comforters by Pacific Coast, Sealy and Joseph Abboud. You can find year round comforters, winter comforters, extra warm comforters and allergy barrier comforters among other models. These comforters feature anti allergen fabric, white goose down, trillium fiber and soft cotton covers. Any of these down covers would make such a plush and comfortable bed.
Down is also really good overall since it provides a much more even heat that provides warmth when it's cold, but also a more lighter protection when it isn't quite as chilly. And since you do spend a large portion of your life sleeping in bed, it makes a lot of sense to have a comfortable cover that you enjoy. Many people simply buy comforter sets which certainly are cheaper, however they do not provide the same amount of comfort as a true down comforter would. And, a comforter is easy to mix up and change with a new duvet, IKEA for instance is one store that sells a lot of them for really good prices and lots of neat designs. Of course, once you're in the market for nice down comforter, you might as well look for a matching down pillow to make your bed complete and Costco probably have a nice selection of those as well.
370TC Baffle Box Down Comforters Light Weight, Year Round, and Extra Warmth
"Restore your body and spirit with this luxuriously soft White Goose Down comforter from Pacific Coast. Choose from Light Warmth, Year Round Warmth or Extra Warmth to suit your personal sleeping preference. 600 fill power Hyperclean white goose down means larger, fluffier clusters that provide exceptional insulation."
Allergy Comfort Allergen Barrier Fabric Collection
"Allergy Comfort Allergen Barrier comforters, mattress pads and pillows are made with an ultra-hygienic anti-allergen fabric which helps protect them against dust mite dander, pollen, odor, pet dander, and other allergens. The fabric is treated with an anti-microbial process which constitutes a state-of-the-art barrier, effective against dust mite dander"
Joseph Abboud Down Alternative Pillow & Comforter Collection
"Decorate your home with a stylish Joseph Abboud premium down alternative comforter or pillow. Filled with quality down alternative that not only looks and feels soft but also is machine washable providing years of fresh clean comfort. The comforter features end-to-end box quilting to prevent fill from shifting and provide equal distribution of warmth."
Sealy Trillium Down Alternative Comforters
"The Sealy Trillium down alternative comforter is the perfect comforter for any climate. Filled with soft, silky Trillium fiber, this comforter offers cozy year round comfort. The true baffle box design allows the fill to loft and prevents shifting so you don’t have to worry about cold spots developing. Premium 360 thread count 100% cotton cover is soft and durable ensuring long lasting performance."
These comforters can be found at costco.com