I have two sets and I just recently purchased the cotton version which I love. The dri-tec is just like your workout cloths so imagine sleeping on that for a sheet they do keep u cool and the material is breathable but everything slips right off your bed this includes your pillow and your blanket! If you have an adjustable bed like I do these are not the sheets for you. A lot like silk sheets they snag very easily not worth the money in my opinion.