#4 clip, all around; trim the front of the sides with a graduated #3 clipper, and (if you’re not doing it yourself, as I always do), square up the bottom edge at the back of your neck.
I give this cut to my own hair every few months (pretty much “as soon as my hair starts to lean to one side or the other”), and the best things about this cut are:
1. No bed head. Ever.
2. I can wash my hair in a minute, and “drying is styling” – which I do with a towel.
3. I haven’t had to comb or brush my hair in years – and I’m not bald!
4. The cut cost me about $25 several years ago (one time) when I bought my last set of hair clippers.
It’s the same cut my dad gave to me in my avatar photo “back in the day”.