There are a few feathers, but the 75/25 number they give on the tag seems really high. I just stuffed a new 3 season UQ this morning. I think 450-500FP is pretty reasonable. It took less than 11oz to get 2" of loft (at the baffles) on a 32"x56" quilt. I didn't do the math, so I can't say for sure, but it seemed better than some down I've handled.