【Certified Hypoallergenic Down Fill】 – Filled with premium 75% European white down and 25% feathers, this down and feather fill offers superior temperature regulation, enhanced support, and greater loft compared to down fiber. This duvet insert is OEKO-TEX certified, ensuring a clean, odor-free, and hypoallergenic sleep environment. Experience the luxury of a vacation in the comfort of your own home 【Skin-Friendly Softness】 – Crafted from 100% cotton with a 300-thread count, this fabric is smooth, breathable, and gentle on the skin—delivering a luxurious and comfortable sleeping experience 【Year-Round Comfort】 – Serta Down Comforter, Four Seasons of Perfect Sleeps. designed with 600 high fill power down for medium warmth and extra fluffy, this down comforter keeps you cozy in winter and comfortably light in summer, ideal for adaptable sleepers all year round 【Durable Baffle-Box & Elegant Design】 – Crafted with a baffle-box construction to prevent down leaking, piped edges for added durability, and corner loops to keep your duvet insert securely in place inside any cover 【Care Tips & Packaging】 – Available in US Twin, Full/Queen, and King sizes. Shipped non-vacuumed to preserve loft; Gently pat and fluff before use. Dry clean only to maintain long-lasting quality and shape