TEMPUR-Breeze Technology works in a 3- step process to draw heat down and out - Step 1: TEMPUR-Breeze Cover Cool to the touch and wicks away excess heat and moisture. Step 2: TEMPUR-Breeze Comfort Layer Draws excess heat away from your body and into the support layer. Step 3: TEMPUR-Climate Support Layer Channels excess heat further away from the sleeper to dissipate. Advanced cooling structure conducts heat away from your body proven to cool comfort. Reduces motion transfer between sleep partners for fewer sleep interruptions. Hypoallergenic.