We will knit the SpeedyHat on a Brother KH400 bulky machine (analog of KH395) with a 9 mm needle pitch.
For demonstration, I’ll use soft acrylic that fits bulky machines — about 300–400 m / 100 g (≈ 330–440 yd / 3.5 oz). You can choose fluffy or smooth yarn — whichever you prefer.