Fossflakes pillows use patented &8216;climate control&8217; to keep your head at a comfortable temperature all night long. Heat is stored in the special filling, releasing only when your own temperature lowers, & this cycle repeats itself throughout the night. The idea for these pillows&8217; unique Fossflake filling came to Danish inventor Lars Foss when he noticed the soft & airy quality of artificial snow. The pillows therefore have the luxuriously indulgent feel of softest natural down. The filling is evenly distributed & will never clump even after repeated washing, so Fossflakes pillows will keep their shape & volume for years.