I’m thinking, if it’s waterproof, it can’t breath.
I found this
18" Cooling Cotton Waterproof Mattress Protector
The sides have polyester, but the top is 100 cotton,
I also found this other 100 cotton protector from cozypure, it says it uses laminated cotton, though it makes no claims about cooling
I personally don’t tend to believe in things that functionally ‘cool’ unless they involve devices that physically generate cold air or water.
However, there are products, fibers, and materials known for their thermal neutrality. For instance, fabrics like linen and certain types of wool are renowned for their ability to remain cool in warm weather by not readily absorbing heat.
Additionally, advanced synthetic fibers such as polyester blends engineered for moisture-wicking and heat dissipation also exhibit these properties under certain conditions, provided when they wick moisture away from the body, it has the opportunity to allow air to dissipate it. These materials neither readily absorb nor retain heat, nor do they efficiently transfer heat back to its source.
Waterproof mattress protectors can potentially keep you less hot if they are designed with breathable materials and allow for adequate airflow.
Mattress protectors with a plastic underside are generally not conducive to keeping you cool. They can inhibit airflow, retain heat, and may contribute to a less comfortable sleeping environment, particularly if you are sensitive to temperature or prefer a cooler bed.
While a cotton mattress protector can contribute to a cooler and more comfortable sleeping experience by promoting breathability and moisture absorption, it may not offer the same level of heat neutrality as other materials specifically engineered for thermal regulation.
I have always maintained that specially engineered materials in bedding and mattress protectors are designed primarily to prevent heat buildup rather than actively cool. They excel in moisture management and breathability, which help maintain a comfortable sleeping temperature by reducing sweat and enhancing airflow. However, these materials do not typically have the capability to actively lower body temperature or create a cooling sensation. Their effectiveness lies in keeping you from overheating rather than providing a cooling effect.
Individual comfort preferences vary, so while these materials can contribute to a more comfortable sleep environment, additional cooling aids may be preferred by those who seek a cooler sensation during sleep.
Hope this helps,
Maverick