It's about 60% floof. He's about 16lbs of cat though. The vet said he is at the maximum he should be and if he gains even half a pound more it'll be time for a proper diet instead of the healthy weight food.
Visit the dechonking guide pinned to the top of r/dechonkers if you would like help evaluating body size/shape. It also has a link to a calorie calculator.
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Mike