Cool-jams NightCool Performance Moisture Wicking Fabric

Cooling pajamas engineered for real sleep

Most sleepwear traps heat and moisture. The Cool-jams NightCool collection is built with Kottinu, a technical synthetic (engineered polyester microfiber) made for firefighter base layers and medical scrubs, now crafted for hot sleepers and night sweats needing moisture-wicking and cooling pajamas. It pulls sweat off your skin and dries in minutes, so you stay dry and comfortable all night long.

• Up to 6x longer lasting than cotton sleepwear
• 50 washes retaining color and sharpness
• 99.9% antimicrobial protection
• Minutes to dry after you sweat, not hours

No sweat. No odor. No pilling.

Night sweats, odor, and worn-out sleepwear are the three biggest complaints in the category. Kottinu was engineered to solve all three at once, in one fabric, with no trade-offs. Here is exactly how.

	No Sweat Microfibers use a proprietary Moisture Transference System (MST) that actively pulls moisture away from skin and moves it to the fabric's outer surface, where it evaporates quickly. You feel dry even when you are warm.
	No Odor Every NightCool garment is treated with Bact-Out®, a 100% natural antimicrobial finish. Third-party ISO laboratory testing confirms it eliminates 99.9% of odor-causing bacteria and remains fully effective after 50 washes.
	No Pilling A unique microfiber formulation causes distressed surface hairs to cleanly break away, allowing fresh fibers to emerge in their place. This self-renewing process means your cooling pajamas keep looking new, wash after wash, year after year.

For the full technical explanation, read the science behind our cooling sleepwear.

Why Kottinu lasts up to 6 times longer than cotton

Kottinu is engineered to last up to 6 times longer than cotton sleepwear. That durability is not a coating or a finish that washes out. It comes from the fiber itself, and it is the direct result of building sleepwear from a technical performance fabric instead of a natural one.

• Higher tensile strength. Kottinu is a continuous engineered filament. Natural fibers like cotton are short staple lengths spun together, so they shed, thin and weaken with every wash and wear cycle.
• Anti-pilling by design. Knit cotton and knit bamboo pill as loose surface fibers tangle into bobbles. Kottinu's microfiber structure lets distressed surface hairs break away cleanly, so the fabric keeps its smooth hand.
• It keeps its strength when wet. Viscose and viscose from bamboo lose a significant share of their strength when wet, which is precisely when sleepwear is under the most stress: night sweats, and the wash cycle itself. Kottinu does not weaken this way.
• It holds its shape and color. Because the fiber resists abrasion and stretching, necklines, hems and prints stay sharp instead of sagging and fading after a season.

Every night, all the benefits

Stays cool all night The MST system in Kottinu microfibers actively moves heat and moisture away from your skin surface, creating a continuous cooling effect that helps regulate body temperature without any cooling inserts, gels, or special technology beyond the fabric itself.	Cotton-like feel, performance behavior Many moisture wicking fabrics feel stiff or synthetic against bare skin. Kottinu was engineered specifically to feel like premium cotton, soft, breathable and natural, while performing like a high-tech fiber.	Full, unrestricted airflow Unlike tight weaves that trap air, our fabric architecture allows continuous air circulation across your skin. Sleeping warm does not have to mean sleeping stuffy, so your body can thermoregulate naturally through the night.
Naturally antimicrobial Bact-Out® is derived from 100% natural sources. Unlike silver-ion or chemical antimicrobials, it does not wash out or degrade over time. Laboratory tests confirm full effectiveness after 50 wash cycles.	Dries in minutes, not hours When a night sweat hits, the fabric moves that moisture out to the surface where it evaporates fast. You are not lying in damp sleepwear waiting for it to dry, which is what turns one hot flash into an hour of lost sleep.	Color-sharp through 50 washes Our fabric retains its color depth and print sharpness through at least 50 wash cycles, far beyond typical sleepwear. Wash in warm water, tumble dry low, and your NightCool pieces keep looking freshly bought.

Fabric specifications

Fabric type	Technical synthetic microfiber
Construction	Knit or woven
Moisture system	MST (proprietary)
Antimicrobial	Bact-Out® (100% natural)
Garment life vs. cotton	Up to 6×
Color retention	50 wash cycles
Pilling	Zero

Simple care. Lasting results.

Kottinu is engineered to maintain all its properties with standard gentle home laundering. No special detergents needed.

Wash Warm | No Bleach | Tumble Dry Low | Iron Low | No Fabric Softener

Full guidance is on our sleepwear care page.

Common questions about cooling pajamas

What makes cooling pajamas different from regular sleepwear?

Standard sleepwear, especially cotton, absorbs moisture and holds it against your skin, which makes you feel damp and warm. True cooling pajamas use moisture wicking fabrics like Kottinu that actively pull sweat away from the skin and move it to the fabric's outer surface to evaporate, keeping you genuinely dry rather than just absorbing the problem.

Does Kottinu really last longer than cotton?

Yes. Kottinu is engineered to last up to 6 times longer than cotton sleepwear. As a technical synthetic it has higher tensile strength than natural staple fibres like cotton and it resists pilling by design, so it keeps its smooth feel, shape and colour through far more wash and wear cycles. It also holds its strength when wet, unlike viscose and viscose from bamboo.

More questions about the fabric, including night sweats, perimenopause, travel and care, are answered in full on the science behind our cooling sleepwear.

Performance fabrics are common in activewear. We brought one to sleepwear.

You spend a third of your life asleep. Shop the fabric and feel the difference for yourself:

• Women's NightCool collection, for cooling pajamas, nightgowns and sets
• Men's NightCool collection, for moisture-wicking pajamas built for hot sleepers
• Menopause and perimenopause cooling pajamas, for night sweats and hot flashes
• DayBasics vs NightCool, if you are deciding between our two lines