A fine rush sleeping mat is smooth to the touch and does not catch on the skin, while after a night sleeping on a rougher mat, one may find one's skin imprinted with a criss-cross pattern.
細的草蓆睡起來觸感滑而不澀，粗的草蓆睡了一晚，可能會在人身上烙下有如經緯的痕跡。