Women's NightCool Long Sleeve T-Shirt

Black Cool-jams NightCool Long Sleeve T-Shirt for women, for women who sleep hot

Navy Cool-jams NightCool Long Sleeve T-Shirt for women, lifestyle view, made for night sweats

Navy Cool-jams NightCool Long Sleeve T-Shirt for women, lightweight cooling sleepwear

Merlot Cool-jams NightCool Long Sleeve T-Shirt for women, for summer nights and year-round hot sleepers

Navy Cool-jams NightCool Long Sleeve T-Shirt for women, made for night sweats

Merlot Cool-jams NightCool Long Sleeve T-Shirt for women, lightweight cooling sleepwear

4.5

Rated 4.5 out of 5 stars

190 Reviews

$60

Color: Black

Black

Navy

Merlot

Size:

Size chart

Size guide

Measure your body and find the band you fall into. Between two sizes, we suggest sizing up, because sleepwear is more comfortable a little looser.

Your measurement	S	M	L	XL	XXL	XXXL
Bust	30.5–33.5	34–36.5	37–39.5	40–42.5	43–45.5	46–48.5
Upper arm	11–12	12.5–13	13.5–14	14.5–15	15.5–16	16.5–17
US dress size	4-6	8-10	12-14	16-18	20-22	24-26
UK / AU	8-10	12-14	16-18	20-22	24-26	28-30
EU	34-36	38-40	42-44	46-48	50-52	54-56

Body measurements, in inches. Dress and international sizes are size labels, so they do not change with the unit switch.

Garment laid flat and measured across. Not body measurements. Compare these with a garment you already own that fits you well.

Garment	S	M	L	XL	XXL	XXXL
Body Length	25	25.5	26.5	27.5	28.5	29.5
Chest	19	20.5	22	24	26	28
Shoulder	16	17	17.75	18.5	19.5	20.5
Sleeve Length	22	22.5	23	23.5	24	24.5
Sleeve Width	8.5	9	9.5	10	10.5	11
Cuff	5.5	5.5	6	6	6.5	6.5
Armhole	9	9.5	10	10.625	11.25	11.875
Neck Width	7	7.25	7.5	7.75	8	8.25
Front Neck Drop	4.75	4.875	5.125	5.375	5.625	5.875
Hem	19.75	21.25	22.75	24.75	26.75	28.75

Garment measurements, in inches.

XXL

XXXL

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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 fast, 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 fast 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 fast, 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.
Read the full returns and exchanges policy.

What fabric is the NightCool Long Sleeve T-Shirt made from?

It is made with Kottinu fabric, a technical synthetic (engineered polyester microfiber) that wicks sweat away from the skin and dries fast. The filaments are spun finer than a hair and knitted open, so the fabric stays breathable through the night and feels closer to cotton than to a slick sports fabric. Every NightCool piece is made in Thailand.

How soft is NightCool?

Cotton-soft. Kottinu is a microfiber spun far finer than standard polyester yarn and knitted for a soft hand, so it feels like a favorite cotton tee rather than a slick sports fabric. It does not need breaking in, and it does not stiffen with washing as long as you skip fabric softener.

Is this long sleeve top good for night sweats and hot flashes?

Yes. It is made for night sweats and hot flashes: the sleeves give full coverage on a cold night, and the Kottinu knit moves sweat off your skin and dries fast, so a rough moment is less likely to end in a soaked shirt and a sheet change. It is sleepwear, not a medical treatment, and it cannot stop a hot flash.

Does a long sleeve top sleep cool, or will it make me hotter?

It sleeps cool. 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. Cotton holds sweat against the skin; Kottinu pulls it to the surface, where it evaporates and carries body heat away with it.

Can I wear it during pregnancy, postpartum or nursing?

It is a relaxed pullover, so it is comfortable through pregnancy and postpartum, and it layers over a tank or under a robe without bulk. For nursing access, the NightCool Snap Front Nightshirt opens all the way down the front.

Why does it feel like cotton if it is synthetic?

Because the fibre is a microfiber, spun far finer than standard polyester yarn and knitted for a soft hand rather than a slick one. Cotton-level softness without the sticky feel of many synthetic wicking fabrics. That cotton feel was the whole design brief.

How do I wash NightCool, and will the cooling wash out?

Machine wash cold or warm with like colors on a gentle cycle, tumble dry low or hang to dry, no bleach. Skip fabric softener and dryer sheets: they coat the microfibers and can reduce wicking, and a re-wash in clear water brings it back. The wicking comes from the fiber and the knit, not a coating, so there is nothing to wash out.

How do I choose my size, and what if it is not right?

Sizes S to 3X. The size chart on this page lists garment measurements laid flat: body length runs 25 inches in S to 29.5 inches in 3X, and sleeve length 22 to 24.5 inches. Tops and bottoms are sized separately, so mix sizes freely. If it is not right, the 30-Night Cool Sleep Trial covers it: sleep in it, wash it, and start a return within 30 days of delivery.

Does NightCool pill?

No. Kottinu resists pilling and holds its shape wash after wash. It is knitted from continuous filament yarn, which has no short fiber ends to ball up, so the face stays smooth. The one care rule that matters: no fabric softener, because the coating dulls the wicking, not the surface.

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{"id":45047152869485,"title":"Black \/ M","option1":"Black","option2":"M","option3":null,"sku":"8698021201100005","requires_shipping":true,"taxable":true,"featured_image":{"id":39251793969261,"product_id":8051038716013,"position":1,"created_at":"2026-08-25T02:29:48-07:00","updated_at":"2026-08-25T02:29:50-07:00","alt":"Black Cool-jams NightCool Long Sleeve T-Shirt for women, for women who sleep hot","width":4096,"height":4096,"src":"\/\/www.cool-jams.com\/cdn\/shop\/files\/womens-nightcool-long-sleeve-t-shirt-black-front-2.jpg?v=1787650190","variant_ids":[45047152836717,45047152869485,45047152902253,45047152935021,45047152967789,45047153000557]},"available":true,"name":"Women's NightCool Long Sleeve T-Shirt - Black \/ M","public_title":"Black \/ M","options":["Black","M"],"price":6000,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"8698021201100005","featured_media":{"alt":"Black Cool-jams NightCool Long Sleeve T-Shirt for women, for women who sleep hot","id":29807058550893,"position":1,"preview_image":{"aspect_ratio":1.0,"height":4096,"width":4096,"src":"\/\/www.cool-jams.com\/cdn\/shop\/files\/womens-nightcool-long-sleeve-t-shirt-black-front-2.jpg?v=1787650190"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

The 3 AM test: cotton or NightCool?

Same sweat. Different night.

	NightCool	Cotton
Sweat on your skin	Pulled off you. Dry fast.	Soaks in and stays.
Odor	Bact-Out finish, so the fabric stays fresher	Nothing in it to help
After the wash	Holds its shape, no pilling	Pills with wear
By 3 AM	Dry	Damp

Try it for 30 nights. Not cooler? Send it back. How the trial works

Customer Reviews

4.5

Rated 4.5 out of 5 stars

Based on 190 reviews

Cooling effectivenessRated 5.0 on a scale of 1 to 5

Fabric WeightRated 0.0 on a scale of minus 2 to 2

Fabric FeelRated 0.0 on a scale of minus 2 to 2

FitRated 0.0 on a scale of minus 2 to 2

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190 reviews

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K
Kelli
3 days ago
Reviewing
Women's DayBasics Long Sleeve Cuff Top
Rated 5 out of 5 stars
5 Stars
Matches with cool jam shorts.
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KG
Karen G.
Verified Buyer
6 days ago
Reviewing
Women's NightCool Long Sleeve T-Shirt
Rated 5 out of 5 stars
NightCool pjs are a Life and Sleep Saver
My NightCool pjs are a life saver. I’ve been buying them for years and I’m so excited that I now know which ones to buy to keep me dry and comfortable. I was waking up drenched in sweat 2-3 times a night. I bought several pairs of pjs from cool jams. Some nights were great some not so great. Now I only have NightCool and I love them. I may wake up with a sweaty neck and scalp but the rest of me is dry. And I don’t wake up during the night!
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C
cool-jams
6 days ago
Thank you for taking the time to write this, Karen!
Knowing exactly which line to reach for makes all the difference, and that is the reason we gave NightCool its own name. We are glad it's keeping you comfortable and has earned a permanent place in your drawer.

If you ever need anything at all, just reach out and we will take care of you.

Vivi, Cool-jams Care Team
BH
betty h. j.
Verified Buyer
2 months ago
Reviewing
Women's DayBasics Long Sleeve Cuffed Pajama Set
Rated 5 out of 5 stars
size medium black jogger sets
i have been trying to get size medium black joggers for months, and they have been out of stock. i wear cool jams exclusively as a person who is disabled, but still enjoys fashionable loungewear. When can i expect to order them?
i love your cool jams.
thank you.
betty h joy
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