This all season down alternative duvet insert features premium 300TC 100% cotton sateen shell and 300GSM microfiber filling, delivering cloud-like fluffy touch and breathable balanced warmth. Elegant silver trim enhances its minimalist luxury appearance for bedroom decoration. Adopted 8″×8″ box stitching technology to fix filling evenly and stop clumping.8 built-in corner & side loops help secure the insert tightly with duvet covers to reduce sliding. OEKO-TEX Standard 100 and BSCI certified, the comforter contains no hazardous substances, safe for human skin and pet-friendly households. It supports machine cold wash and low heat tumble dry, retains fluffy performance without flattening after repeated cleaning. Queen size 88″×88″ ready for shipment. Custom sizes, colors and OEM bulk orders are accepted, great choice for home, vacation rental and hotel bedding procurement.