100% Cotton Premium Filling - This Serta duvet insert is filled with 90% white goose feather fiber and 10% white goose down fiber. Our duvet comforter is made of 100% cotton fabric, skin-friendly and soft. Excellent Design- 8 Corner Loops can attach the duvet cover and prevent down comforter from shifting.With End-To-End sewn-through construction, the down filling could be distributed in its proper place. Find Your Ideal Comforter - We offer five sizes and three thicknesses( Light Warmth & All Seasons Medium Warmth & Extra Warmth). Twin (68"x 90"), Queen (90"x 90"), Oversize Queen (90"x 98"), King (106"x 90"), Oversize king (108"x 98") If you're a hot sleeper or transitioning into the warmer months, we recommend trying the All Season Medium Warmth version Care Tips- Serta comforter comes with a vacuum pack, please pat it up gently and wait a few moments for it back to original lofty. Recommend Dry Clean only. The fastest way to restore fluffiness: Place it in a dryer on low heat or air dry for about 17 minutes to restore its fluffiness.