To crochet the pouf you first crochet a spiral circle increasing stitches, then you crochet appx. 3 rounds straight, and then you crochet another spiral where you decrease stitches. I crochet simply using my fingers because I think it's too much hassle trying to find a crochet-needle in the right size. You would probably need 15-20mm crochet needle if you want to use a needle. It's important that you crochet very tight, because afterwards you will fill the pouf, and if the work isn't tight then gaps in the work will appear, and that is not pretty.
When you crochet, a loop to crochet into always has 2 chains, I crochet into only one of them and the one to the back, this is because I like the pattern this creates, you get a thin line of chains that run around the pouf. It's also possible to crochet into both chains, then you will end-up using a little more yarn.
Rnd1; make a loop, then chain 2, then 6sc into the 2nd loop from the hook, a bit tricky. This makes the first tiny round.
Rnd2: 2sc into all 6 loops: 12 sc
rnd 3-10; inc. 6 sc evenly spaced: 60 sc.
rnd 11-12 (or 13, 14 depending on how tall you want the pouf); work even in sc.
rnd 13-22; dec 6 sc evenly spaced; 6 sc.
depending on how much yarn you have or how big you want your pouf, you decide how big you make the spiral. My biggest pouf, the light-grey one had 60 sc at it's max. The smallest, the dark brown had 48sc at it's max.