The Science Behind Cool-jams Sleepwear
The Science Behind Cool-jams NightCool Sleepwear
A performance fabric for hot sleepers
Cool-jams NightCool is made with Kottinu fabric, an engineered polyester microfiber designed to wick sweat and dry fast. It is our performance sleepwear line for hot sleepers, including people choosing sleepwear for nights with night sweats or hot flashes.
NightCool is sleepwear, not a medical treatment. It does not treat the cause of night sweats or hot flashes.
How moisture-wicking fabric works
Moisture-wicking fabric moves moisture along its fibers toward the fabric surface, where it can spread out and evaporate. NightCool combines this moisture movement with a breathable knit for cooling comfort.
- Moisture moves away from the skin through the fabric.
- It spreads across the fabric surface.
- Air around the fabric helps it dry.
Comfort and fabric freshness
NightCool has a soft feel and a lightweight, breathable construction. Its fabric finish helps resist odor-causing bacteria in the fabric, helping it stay fresher between washes.
Choose a fabric for your nights
NightCool is our engineered moisture-wicking performance line for hot sleepers and heavier sweat nights.
DayBasics is soft everyday sleepwear and loungewear. It is a comfort line rather than the NightCool performance fabric.
BambooSoft is made with viscose from bamboo. It offers softness, breathability, absorbency and a cool-to-the-touch feel for warm nights and everyday comfort.
Choose by the feel, coverage and moisture management you want. See our DayBasics and NightCool guide for more about those two lines.
Find your preferred coverage
The women's NightCool collection includes nightgowns, nightshirts and separates. Explore the men's NightCool collection for tops and bottoms. Check each product for its current sizes, colors, fiber content and availability.
NightCool questions
What is the fabric made of?
NightCool uses an engineered polyester microfiber. It is a synthetic performance fabric.
Which line should I choose if I sleep hot?
Start with NightCool if engineered moisture-wicking performance is your priority. Choose DayBasics for everyday comfort, or BambooSoft for the soft feel of viscose from bamboo.
Can I choose NightCool for nights with night sweats or hot flashes?
Yes. Those are occasions people choose NightCool for, rather than conditions the sleepwear treats. Choose the cut and coverage that feel comfortable to you.
How should I care for it?
Follow the care label on your garment. Avoid fabric softener, which can coat the fibers and affect moisture wicking. Our sleepwear care page has more guidance.