Pillow Loft and Firmness Guide: How to Measure and Choose
Loft (height) and firmness determine how well your pillow supports your neck. Cooling matters, but if your alignment is off, you’ll still wake up sore.
Last Updated: March 2026.
Loft vs Firmness (Not the Same Thing)
- Loft: The pillow’s height before and after you lie down.
- Firmness: How much the pillow resists compression.
A pillow can be high loft but soft, or low loft but firm. You need the right combination for your sleep position.
How to Measure Loft at Home
- Place the pillow on a flat surface.
- Measure the height at the center.
- Lie down for 5 minutes, then measure the compressed height.
The compressed loft is what matters most for alignment.
Recommended Loft by Sleep Position
- Side sleepers: 4.5-5.5 inches (medium-firm)
- Back sleepers: 3.5-4.5 inches (medium)
- Stomach sleepers: 2-3 inches (soft)
See our position-specific lists: best cooling pillows for side sleepers, best cooling pillows for back sleepers, and best cooling pillows for stomach sleepers.
How Firmness Affects Cooling
Softer pillows compress more, which can reduce airflow. Firmer pillows maintain air channels and stay cooler. That’s why structured pillows like Coop Sleep Goods Eden review cool so well.
Adjustability Tips
Adjustable pillows like Coop Home Goods Eden review let you customize loft, but removing too much fill can reduce cooling performance. If you’re unsure, start by removing 10-15% of the fill and test for two nights.
Ready to Buy?
If you want the best picks by position, start with best cooling pillows for side sleepers or best cooling pillows for back sleepers. For full material guidance, visit cooling pillow buying guide.