Our 100% Dupioni Mulberry Silk Duvet Insert is filled with top grade dupioni long-strand mulberry silk, and encased in 100% GOTS certified organic cotton. The silk duvet is soft, fluffy, lightweight yet warm. Both fills and shell are OEKO-TEX certified for not containing any harmful chemicals. 

• Fills: 100% Dupioni Long Strand Mulberry Silk - the most premium grade of silk.  
• Shell: GOTS certified organic cotton in 300 thread count and sateen weave. The fabric features a natural warm white with a lustrous glow. 
• Tack stitch: long strand silk is "sticky" and attaches naturally and firmly to the cotton shell. Using tight stitching such as box construction is not only unnecessary but also reduces silk's fluffiness and luxury texture. We thus use tack stitch. This helps reinforce the position of the insert without sacrificing the unique properties of silk duvet. 
• Three loops on each side of the duvet to tie with a cover. 
• Handmade by artisans in China with decades of experience: the fillings are hand-stretched from silk cocoons to ensure the even spread of silk fibre. 

• Duvet cover is strongly recommended to be used together.
• Sun-curing recommended to remove moisture and dirt.
• Dry clean at the Professional's. 
• Spot clean if necessary.