Women's NightCool Long Sleeve T-Shirt
- Low stock - 1 item left
- Backordered, shipping soon
Free U.S. shipping on all orders $120+
Wake up cool and dry. The Cool-jams Women's NightCool Long Sleeve T-Shirt is a cooling sleep shirt built for hot sleepers and for nights when you run warm. This moisture-wicking sleep shirt is made from our proprietary Kottinu fabric, which pulls perspiration off your skin and dries in minutes, so you stay comfortable all night.
Part of the Cool-jams NightCool collection of cooling sleepwear for women.
More about the Long Sleeve T-Shirt
The Cool-jams NightCool Long Sleeve T-Shirt covers the arms without the heat that usually follows, which is the whole point when you run hot at night but the room is cold. The Kottinu knit is temperature-regulating: it wicks sweat off the skin, dries in minutes and keeps air moving through the sleeve. An odor-control finish helps the fabric stay fresher between washes. It is a lightweight knit cut relaxed through the body, so it layers under a robe or over a tank without bulk. In Black, Navy and Merlot, in sizes S to 3X.
Why wear long sleeves if I sleep hot?
Rooms and bodies do not always agree. A long sleeve in a fast-drying knit gives you coverage when the room is cold and keeps working if you warm up during the night.
Is this a top or a nightshirt?
It is a t-shirt style top, cut to be worn with a separate bottom. If you want a one-piece knee-length shirt, see the NightCool nightshirts.
Is it thin enough to layer?
Yes. It is a lightweight knit that layers under a robe or over a tank without bulk.
Why you'll love it
- Long sleeves for full coverage without giving up cooling performance
- Kottinu moisture-wicking fabric that wicks perspiration and dries quickly, engineered for night sweats and hot flashes
- Soft, cotton-like feel that resists pilling and holds its shape
- Bact-Out finish helps the fabric stay fresher between washes
- Mix and match with any NightCool bottom for a complete long-sleeve sleep set
What is Kottinu?
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. Soft and smooth with a cotton-like feel, it pulls sweat off your skin, dries in minutes, carrying body heat away with it.
A Bact-Out finish helps the fabric resist odor, so it stays fresher between washes. Kottinu resists pilling, holds its shape, and machine washes easily.
How to care for Kottinu
- Machine wash cold or warm with like colors, gentle cycle
- Skip fabric softener and dryer sheets, they coat the microfibers and can reduce wicking
- Tumble dry low or hang to dry, Kottinu dries fast
- No bleach
- Holds its shape and resists pilling wash after wash
Where it is made
Every NightCool piece is made in Thailand by the same factory partner Cool-jams has trusted since day one.
- Shipping. Free on Continental U.S. orders over $120. Ships in about a business day, arrives in 3 to 7. We ship across the U.S. and Canada.
- Returns. 30 days from delivery. Start at our Returns Center with your order number and print a prepaid label. Gifts without an order number, orders from outside the U.S., and anything faulty: email [email protected].
- Exchanges. Free within the same 30 days, no admin fee.
- Refunds. Full-price store credit with no fee, or your original payment method less a $9.95 admin fee.
- 30-Night Cool Sleep Trial. Sleep in NightCool. Wash it. Not right? Send it back within 30 nights for store credit or a refund.
- DayBasics is Final Sale. No returns or exchanges as we retire the collection. Faults are always covered.
- Read the full returns and exchanges policy.

