Black Cool-jams NightCool Long Tank Gown for women, when you run hot at night

Black Cool-jams NightCool Long Tank Gown for women, lifestyle view, for anyone who overheats at night

Black Cool-jams NightCool Long Tank Gown for women, lifestyle view, built for the sweatiest sleepers

Navy Cool-jams NightCool Long Tank Gown for women, stays dry-feeling through night sweats

Navy Cool-jams NightCool Long Tank Gown for women, lifestyle view, when you run hot at night

Merlot Cool-jams NightCool Long Tank Gown for women, for anyone who overheats at night

Merlot Cool-jams NightCool Long Tank Gown for women, lifestyle view, built for the sweatiest sleepers

Merlot Cool-jams NightCool Long Tank Gown for women, lifestyle view, stays dry-feeling through night sweats

Navy Cool-jams NightCool Long Tank Gown for women, group view, when you run hot at night

4.8

Rated 4.8 out of 5 stars

161 Reviews

$80

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	30–33	33.5–36	36.5–39	39.5–42	42.5–45	45.5–51
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	45	45	45	45	45	45
Chest	18.25	19.75	21.75	23.75	25.75	27.75
Shoulder	12.25	13	13	13.75	14.5	15.25
Neck Width	8.25	9	9	9.75	10.5	10.5
Front Neck Drop	3.375	3.5	3.5	3.625	3.75	3.875
Hem	32.75	34.25	36.25	38.25	40.25	42.25

Garment measurements, in inches.

XXL

XXXL

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Wake up cool and dry. The Cool-jams Women's NightCool Long Tank Gown is a cooling nightgown built for hot sleepers and for nights when you run warm. This moisture-wicking nightgown 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 Tank Gown

The Cool-jams NightCool Long Tank Gown is a long cooling nightgown for menopausal night sweats and for anyone who wants more coverage without more heat. The breathable Kottinu knit wicks perspiration off the skin and dries fast, and an odor-control finish helps the fabric stay fresher between washes. The sleeveless tank cut keeps fabric off the arms and shoulders, and the longer, straight skirt hangs rather than winding around you as you move. In Black, Navy and Merlot, in sizes S to 3X.

How long is this nightgown?

It is a full-length gown, the longest in the NightCool range and noticeably longer than the knee-length Gathered Tank Nightgown in the same fabric.

Is a long nightgown too warm for night sweats?

Not in this fabric. Length adds coverage, not heat, because Kottinu is a temperature-regulating knit that moves moisture and keeps air flowing.

Does it have a built-in bra?

No, this style has no built-in support. It is cut as a straight sleeveless gown.

Why you'll love it

Full-length tank gown with shin-length coverage and a sleeveless design for maximum airflow
Relaxed, non-cling silhouette that drapes without trapping heat
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, machine washes easily
Bact-Out finish helps the fabric stay fresher between washes

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.

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{"id":45047153426541,"title":"Black \/ S","option1":"Black","option2":"S","option3":null,"sku":"8698049591100004","requires_shipping":true,"taxable":true,"featured_image":{"id":38593365246061,"product_id":8051038781549,"position":1,"created_at":"2026-06-19T01:23:55-07:00","updated_at":"2026-07-27T01:04:44-07:00","alt":"Black Cool-jams NightCool Long Tank Gown for women, when you run hot at night","width":2048,"height":2048,"src":"\/\/www.cool-jams.com\/cdn\/shop\/files\/womens-nightcool-long-tank-gown-6439693.png?v=1785139484","variant_ids":[45047153426541,45047153459309,45047153492077,45047153524845,45047153557613,45047153590381]},"available":true,"name":"Women's NightCool Long Tank Gown - Black \/ S","public_title":"Black \/ S","options":["Black","S"],"price":8000,"weight":0,"compare_at_price":null,"inventory_management":"shopify","barcode":"8698049591100004","featured_media":{"alt":"Black Cool-jams NightCool Long Tank Gown for women, when you run hot at night","id":29177044107373,"position":1,"preview_image":{"aspect_ratio":1.0,"height":2048,"width":2048,"src":"\/\/www.cool-jams.com\/cdn\/shop\/files\/womens-nightcool-long-tank-gown-6439693.png?v=1785139484"}},"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

4.8

Rated 4.8 out of 5 stars

Based on 161 reviews

Cooling effectivenessRated 1.0 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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161 reviews

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JD
Jane D.
Verified Buyer
3 days ago
Reviewing
Women's DayBasics Long Tank Gown
Rated 5 out of 5 stars
I love my cool-jams!
I have at least 8 cool-jam night gowns. Half are short and the other half are long. I love all the beautiful colors. They wash up so nice and are so comfortable.
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C
cool-jams
3 minutes ago
Thank you for the wonderful review, Jane! We absolutely love that you have built such a great collection of our nightgowns. It's great to hear you are enjoying the variety of colors as well.

Vivi, Cool-jams Care Team
RK
Ronni K.
Verified Buyer
4 weeks ago
Reviewing
Women's NightCool Long Tank Gown
Rated 5 out of 5 stars
The return of the great long tank gowns!
The material is just like it used to be, sleek and cooling. The scoop neck is actually a scoop again with nice roomy armholes. Thank you, Cool-jams for returning to your roots.
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C
cool-jams
6 days ago
Thank you for this, Ronni 💙 You noticed exactly the things we care about, the hand of the knit and the neckline. Everything sold as NightCool now is the original cooling fabric, so what you have is the real thing. Roots is the right word for it. Thank you for coming back ✨

Fey, Cool-jams Care Team
CV
Christine V.
Verified Buyer
1 month ago
Reviewing
Women's DayBasics Long Tank Gown
Rated 5 out of 5 stars
Love the night gown
comfy and supportive, which I like when sleeping too. Thought the supportive cups with a bit of padding would make me look too bodacious for 77 years, but perfect and great to keep cool at night.
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Women's NightCool Long Tank Gown