I bought a king size and it said on the package king or California King which are two different sizes. The king size comforter insert I put in it shifts all around in the extra space, folds up, and generally it's all discombobulated. It's impossible to make up the bed cause there's so much extra room in the duvet cover that it just has fabric hanging and the lightweight comforter is all turned around inside of it. I've used this comforter insert with other duvet covers without this happening. Overall, I regret this buy.