Much better at staying cool than my last, non-temurpedic pillow. Supportive but definitely not as firm as the full memory foam pillows. The inside is like a bunch of little chunks, which you can unzip and take them out to change the thickness. I'm hesitant to put a protector on it in case it interferes with the cooling effect but I wish I could. Overall very big upgrade and no longer have to fluff my pillows all the time.