I think the on
@FoFa posted was the kind I saw. I also flip my pillow because sometimes in warmer weather I wake up after sleeping in one spot and the pillow is a bit damp from perspiration. I don't toss and turn too much, mostly a left or right side sleeper. If I lie on my back too long my hands go numb, I guess I'm pinching a nerve or something. My DW likes to sleep on her stomach, something I rarely do. 4951