PeachSkinSheets Night Sweats: The Original Moisture Wicking, 1500tc Soft Twin Sheet Set Classic White

What fabric is it made of? Natural or synthetic?

Can you bleach the white colored sheets?

Are these deep pocket? Is the elastic band in the corners on the fitted sheet or the whole thing?

Did I read, in one of the reviews, that they are not to be washed in a machine with an agitator? If that's what we own, then what?