16 Spa Gifts to Treat Your Friends (or Yourself!) This Christmas: "This one comes with an insanely soft duvet cover you can remove for easy washing, and the blanket itself is available in 15- and 20-pound weight options, so you can get the best fit for you. (The general rule is the blanket should be about 10% of your body weight.) Pair it with Brooklyn Bedding's signature Tencel Sateen Sheets for your most restful sleep ever."