ANSWER:

Folding the sleeves is not permissible unless there is a justification for it.  

Kindly refer to the following link(s):

 

My question is I am from Kashmir we have harsh winters here while doing wudhu for prayers we roll our handcuffs to wash arms up to elbows then sometimes we keep handcuffs rolled and pray the Salah as arms are wet and after completing prayer we rolled down handcuffs So question arises keeping handcuffs rolled is allowed in Salah or it is sin