I agree with pheets. I’ve come to find that I use Nylon sheets instead of cotton. I use nylon instead of cotton during the summer when I need to keep them clean or on chilly nights. I find that cotton tends to stay cleaner longer. During the winter, I put nylon sheets on my horses under their turnouts. This way I can wash the nylon sheets every week so my horse stays cleaner. This way the inside of the turnout sheet or blanket doesn’t become stinky and gross.