i love a cold pillow. your question got me to thinking . . . remember many many years ago when sheets were ironed. 100% cotton just like today. however, they way cotton is grown today is no comparison. there are way more chemicals put into fabrics, both when growing the cotton and in the production of the fabric. that is the main reason we do not need to iron cotton anymore. thanks for the question, so now i am for sure going to search out some organic sheets. see if they stay cold.