West elm bestseller duvet cover frost gray color Full/Queen Duvet: 88"l x 92"w best-selling linen duvet cover is woven from premium quality European flax with a luxe, lived in texture that gets softer with each wash. Made in a Fair Trade Certified™ facility and prized for its breathability, it's a dreamy option for any season, with an heirloom quality you'll enjoy for years to come.