To begin, I've thought ages what to do with the chair in my sons' room, to not ruin the pavement. Finally I've found in Pinterest chairs......with socks :)
I've realized them with same whool of the carpet (look at the picture), I've done 6 single crochet (hook number 6), working in circular way, in the second round I've doubled them and so on with other 10 rounds of 12 single crochets. At the end, I've done four socks equal to the one explained before.
By the way, the measure and the points depend form the dimension of the chair.
Result: no more noise and no more signs on the pavement :) :) :)