Keep a Cooling Pillow Cool All Summer: 6 Practical Steps
By MUJI USA | Published: 2026-10-16
Category: How-to Guides
Cooling gel and urethane pillows only feel cool when air can reach them. Here is a simple routine to keep your pillow cool through hot, humid summer nights.
Quick answer
A cooling pillow stays cool only when air can carry heat away from it. Air it out daily, keep heavy bedding and mattress layers from trapping heat underneath, and wash the pillowcase weekly. If your room itself stays warm and humid, no pillow can stay cool on its own, so treat airflow and bedding as the real fix.
Why a cooling pillow warms up in the first place
Gel and urethane pillows feel cool because heat moves from your head into the pillow and then out into the room. If that heat has nowhere to go, the pillow slowly matches your body temperature and the cooling effect disappears. The two most common causes are a pillowcase that blocks airflow and a mattress or protector that traps heat below the pillow.
This is why a cooling pillow can feel great in May and disappointing in August. The pillow has not changed; the room and the bedding around it have.
Match the pillow to the season, not just the sleeper
Some cooling pillows are designed with two usable sides, which lets you choose a cooler or softer feel depending on the night. If yours has that option, flip it during heat waves instead of using the same side year-round. Rotating sides also gives the compressed side time to recover, which helps the pillow keep its shape.
If you sleep hot most of the year, a pillow with a gel or urethane core is a better starting point than a down or down-alternative pillow, which holds warmth close to the head.
Keep the room working with the pillow
A fan aimed across the pillow, not directly at your face, moves heat away without drying your eyes and throat. In humid climates, a dehumidifier often helps more than a fan, because damp air holds heat and slows evaporation. If you use air conditioning, set it to run steadily rather than blasting it right before bed; a stable cool room keeps the pillow cool longer than a quick temperature drop.
Care habits that protect the cooling layer
Check the care label before washing anything. Urethane foam and gel cores generally should not go into a washing machine or dryer, because heat and agitation can break down the foam. Wash the removable cover and pillowcase instead, and let the core air out in a shaded, well-ventilated spot rather than in direct sun.
Avoid stacking heavy quilts or extra pillows on top of a cooling pillow during the day. Weight compresses the foam and traps warmth, so the pillow starts the night warmer than it needs to be.
Your nightly and weekly cooling routine
- 1. Air the pillow before bed: Pull the pillow out from under the covers and let it sit in open air for 15 to 30 minutes while you get ready for bed. This releases heat stored from the previous night and from being pressed under bedding all day. Checkpoint: if the pillow still feels warm to the touch after airing, your room is holding too much heat.
- 2. Use a breathable pillowcase: Choose a smooth, thin pillowcase rather than a thick quilted or flannel one. A heavy case acts like a blanket for the pillow and blocks the airflow that makes the cooling layer work. Common mistake: doubling up a decorative sham over the pillowcase, which traps heat right where your head rests.
- 3. Clear the space under and around the pillow: Keep the area under the pillow free of extra blankets, folded quilts, or a second pillow. Heat needs a path away from the pillow, and a clear gap lets air move underneath. Checkpoint: slide your hand under the pillow. If it feels noticeably warmer than the room, remove whatever is trapping heat.
- 4. Rotate or flip the pillow each night: If your pillow has two usable sides, alternate them. Rotating gives the compressed side time to recover and puts the cooler surface against your head at the start of the night. Common mistake: sleeping on the same side every night, which flattens one side and keeps the other from ever feeling fresh.
- 5. Wash the cover or pillowcase weekly: Sweat, skin oils, and sunscreen residue build up on fabric and reduce airflow. Wash the removable cover or pillowcase according to the care label, and let the core air out separately in a shaded spot. Checkpoint: never put a urethane or gel core in the washer or dryer unless the label explicitly says it is safe.
- 6. Adjust the room, not just the pillow: Run a fan across the bed, use a dehumidifier in damp weather, or keep air conditioning at a steady overnight temperature. These changes do more for a cooling pillow than any single pillow accessory. Next step: if the pillow still warms up quickly after these steps, the room's heat and humidity are the limiting factor, not the pillow.
Product facts
- Cooling Urethane Pillow: The Cooling Urethane Pillow uses a polyurethane foam and cooling gel inner core, with low rebound urethane foam that gradually conforms to the neck's natural curve. It can be used on either side. The gel core is what draws heat away, and the two-sided design lets you rotate the pillow for a fresher feel. The slow-conforming foam means the pillow supports your neck without bouncing back immediately, so give it a few nights to adjust.
