LaCrosse Down Comforter, Extra Warmth, King, Copen Blue Our best-selling down comforter Hypoallergenic 500-550 fill power TCS Down provides loft and warmth 250-thread-count combed cotton shell. Sewn-through 12 box construction Features corner loops that attach to the corner ties in our duvet covers to hold it in place Machine Wash. Lifetime guarantee.