No! Absolutely the opposite. It stays cool. One man who bought the pillow for his TMJ Spasms (and was happy he did), also reported that his wife now cuddles him at night again. It seems he was quite the night-sweater, and our pillows, by virtue of staying cool, also cooled him down, and thus dramatically reduced his night-sweat issues. The menopause ‘set’ also adore our pillows for this reason – there is no flipping of the pillow necessary – the highly breathable bamboo actually wicks away sweat from the skin, and the hollow hulls keep air passing through the pillow throughout the night, which results in no hot spots!