I live it the southern US where it gets pretty hot, even at night. I use a cooling gel pillow, but sometimes the covers that I use trap my body heat and keep the pillow from doing its thing. That's not the case, here. The AllerEase pillow is made of cotton and doesn't trap body heat. It's super breathable and I don't wake up sweating anymore. I love that it is finished with an antimicrobial coating, but still maintains its softness. I've used other allergy-relieving cases in the past that feel kind of like plastic and those are just not comfortable. This pillow protector reminds me of a high quality cotton pillow case that has been perfectly starched - only I didn't have to put in the work of ironing it! I love that it blocks a variety of allergens from clinging to my pillow. It just feels cleaner. It's also super easy to clean. You can just throw it in the washer & dryer with your other bedding. No special treatment needed!