Black Cool-jams NightCool Boxer Shorts for men, front view close-up

Black Cool-jams NightCool Boxer Shorts for men, three-quarter view close-up

Black Cool-jams NightCool Boxer Shorts for men, side view close-up

Black Cool-jams NightCool Boxer Shorts for men, back view close-up

Black Cool-jams NightCool Boxer Shorts for men

Black Cool-jams NightCool Boxer Shorts for men, lifestyle view, for men who run hot at night

Black Cool-jams NightCool Boxer Shorts for men, lifestyle view

Navy Cool-jams NightCool Boxer Shorts for men, three-quarter view close-up

Navy Cool-jams NightCool Boxer Shorts for men, side view close-up

Navy Cool-jams NightCool Boxer Shorts for men, back view close-up

Navy Cool-jams NightCool Boxer Shorts for men, temperature-regulating sleep fabric

Navy Cool-jams NightCool Boxer Shorts for men, lifestyle view

Navy Cool-jams NightCool Boxer Shorts for men, lifestyle view, temperature-regulating sleep fabric

Navy Cool-jams NightCool Boxer Shorts for men, front view close-up

Join the Cool Club, get 100 coins

4.8

Rated 4.8 out of 5 stars

75 Reviews

$79.00 $63.20 Save $15.80

$0.17 a night

Stay cool all night
Wicks sweat away
Dries fast

Color: Navy

Navy

Black

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
Waist	24–26	26.5–28	28.5–31	31.5–34	34.5–37	37.5–40
Hip	38.5–41	41.5–43.5	44–46.5	47–49.5	50–52.5	53–55.5
Thigh	23.5–25	25.5–26.5	27–28	28.5–29.5	30–31	31.5–32.5

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
Waist	14	15	16.5	18	19.5	21
Hip	21.5	22.875	24.25	25.75	27.25	28.75
Thigh	13.75	14.5	15.25	16	16.75	17.5
Leg Opening	12.75	13.5	14.25	15	15.75	16.5
Front Rise	12.75	13.25	13.75	14.25	14.75	15.25
Back Rise	16.75	17.25	17.75	18.25	18.75	19.25
Inseam	5.25	5.25	5.25	5.25	5.25	5.25
Outseam	17	17.5	18	18.5	19	19.5

Garment measurements, in inches.

XXL

In stock, ready to ship
Backordered, shipping soon

Free U.S. shipping on all orders $120+

Running hot at night? These soft men's sleep boxers wick sweat away and dry quickly. Made for night sweats, hot sleepers, travel, warm summer nights, or as a lightweight base layer. Sleep cooler, and rest easy with our 30-Night Trial.

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.

Men's boxers for sleeping: the layer closest to you, in the fabric that matters most there.

Wear it for

Hot sleepers and night sweats. It wicks and dries fast where you feel it first.
Summer nights. Men's cooling sleep shorts, worn on their own when anything else is too much.
Under NightCool pants, on the nights you want both.
Travel. Light enough to pack several and quick to wash out.
Around the house, first thing and last thing.

Why these men's sleep shorts feel good

A relaxed fit that does not bind or ride up.
Soft, cotton-like and smooth, with flat seams.
The waistband sits without digging in.
Bact-Out keeps them fresher between washes.
They hold their shape and resist pilling.

Good to know

Two colours: Navy and Black. Sizes M to 2XL.
Machine wash cold or warm on a gentle cycle, tumble dry low or hang to dry. No bleach, and skip fabric softener and dryer sheets: they coat the microfibres and can reduce wicking.
Made in Thailand by the same factory partner Cool-jams has worked with since the beginning.
Sleep in it for 30 nights. Not right? Send it back for store credit or a refund.

Wake up cool and dry. The Cool-jams Men's NightCool Boxer Shorts are men's sleep shorts in a boxer cut, built for hot sleepers and for nights when you run warm. These moisture-wicking boxer shorts are 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 men.

More about the Boxer Shorts

The Cool-jams NightCool Boxer Shorts are cooling sleep boxers for men with night sweats. The Kottinu knit wicks perspiration off the skin as it forms and dries fast, which is the difference between waking up damp and waking up comfortable, and an odor-control finish helps the fabric stay fresher between washes. The waistband is soft and elastic, the leg is cut roomy, and there is no bunching at the thigh when you turn over. In Navy and Black, in sizes M to 2X.

Are these underwear or sleepwear?

They are cut as sleep boxers, designed to be worn on their own in bed. The roomier leg and soft waistband are built for sleeping rather than for wearing under trousers.

Do men get night sweats too?

Yes, and it is common. These are cut from the same Kottinu performance fabric as our women's night sweat range.

What top goes with them?

The NightCool Crew Neck T-Shirt and the NightCool Tank Top are the matching pieces in the men's range.

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.
30-Night Cool Sleep Trial. Sleep in it. Wash it. Not right? Start a return within 30 days of delivery for a refund, store credit or an exchange. No fees, free U.S. return label.
How. Start at our Returns Center with your order number. Gifts without an order number, orders from outside the U.S., and anything faulty: email [email protected].
DayBasics is Final Sale. No returns or exchanges as we retire the collection.
Read the full returns and exchanges policy.

Men's NightCool Boxer Shorts~~$79~~$63.20 Navy · M

$79 $63.20 Save $15.80

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{"id":45047155327085,"title":"Navy \/ M","option1":"Navy","option2":"M","option3":null,"sku":"8698043952100105","requires_shipping":true,"taxable":true,"featured_image":{"id":39732675575917,"product_id":8051038847085,"position":11,"created_at":"2026-09-30T22:40:39-07:00","updated_at":"2026-09-30T22:40:41-07:00","alt":"Navy Cool-jams NightCool Boxer Shorts for men, three-quarter view close-up","width":4096,"height":4096,"src":"\/\/www.cool-jams.com\/cdn\/shop\/files\/nightcool-mens-boxer-shorts-navy-front-03.jpg?v=1790833241","variant_ids":[45047155327085,45047155359853,45047155392621,45047155425389]},"available":true,"name":"Men's NightCool Boxer Shorts - Navy \/ M","public_title":"Navy \/ M","options":["Navy","M"],"price":6320,"weight":0,"compare_at_price":7900,"inventory_management":"shopify","barcode":"8698043952100105","featured_media":{"alt":"Navy Cool-jams NightCool Boxer Shorts for men, three-quarter view close-up","id":46243692150893,"position":11,"preview_image":{"aspect_ratio":1.0,"height":4096,"width":4096,"src":"\/\/www.cool-jams.com\/cdn\/shop\/files\/nightcool-mens-boxer-shorts-navy-front-03.jpg?v=1790833241"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

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
Waist	24–26	26.5–28	28.5–31	31.5–34	34.5–37	37.5–40
Hip	38.5–41	41.5–43.5	44–46.5	47–49.5	50–52.5	53–55.5
Thigh	23.5–25	25.5–26.5	27–28	28.5–29.5	30–31	31.5–32.5

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
Waist	14	15	16.5	18	19.5	21
Hip	21.5	22.875	24.25	25.75	27.25	28.75
Thigh	13.75	14.5	15.25	16	16.75	17.5
Leg Opening	12.75	13.5	14.25	15	15.75	16.5
Front Rise	12.75	13.25	13.75	14.25	14.75	15.25
Back Rise	16.75	17.25	17.75	18.25	18.75	19.25
Inseam	5.25	5.25	5.25	5.25	5.25	5.25
Outseam	17	17.5	18	18.5	19	19.5

Garment measurements, in inches.

“My mom loved them! She said they’re very nice and keep her cool”Julie

“These fit well, keep me cool and are pretty too!”Susan K.

“Love them! They dry so quickly!”robin

“Helps with night sweats.”Kristie D.

“Love my PJ's. They are cool and comfortable to wear and look great on.”Phyllis K.

“Fantastic jams, great fit”Marcia

“Have 2 pairs and like that they don’t make you overheated.”Linda S.

“The fabric is wonderful, cool and soft!”Georgia H.

“I love all my cool jam sleepwear.”Elaine A.

“Absolutely love my gowns! No more up and down temps. Worth every penny”Penny P.

“They fit well. They wick away my sweat. I used to go through two t-shirts a night.”Bradford N.

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 75 reviews

Write a Review (Opens in a new tab)

75 reviews

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JW
Janet W.
Verified Buyer
2 years ago
Reviewing
Men's Moisture Wicking Boxer Separate
Rated 5 out of 5 stars
Cool-jams men’s sleep shorts
I bought these Cool-jams men’s black sleep shorts for my son-in-law for Christmas this year. He absolutely loves them! He likes how soft and comfortable they are. They don’t ride up and are a nice thin material that keeps him cool when sleeping. Being light-weight they pack easily and don’t take up much room in his bag when he travels. It was the best personal gift I could buy for him. Thank you Cool-jams for making such a wonderful product! I would know because I love my Cool-jams nightgown and matching robe that I bought a few years ago and highly recommend, too!
Was this helpful?
MK
Mary K.
Verified Buyer
2 years ago
Reviewing
Men's Moisture Wicking Boxer Pajama Set
Rated 4 out of 5 stars
Colors didn’t match.
Ordered the cool jams men boxer set. Ordered as set, boxer & shirt were in separate packaging and the navy colors were not the same shade of navy.. Also ordered the gray color for my son and the gray colors match.
Was this helpful?
CB
Craig B.
Verified Buyer
2 years ago
Reviewing
Men's Moisture Wicking Boxer Pajama Set
Rated 5 out of 5 stars
PJ pair
Comfortable and keeps me cool
Was this helpful?

Men's NightCool Boxer Shorts

Size guide

What is Kottinu?

Wear it for

Why these men's sleep shorts feel good

Good to know

Are these underwear or sleepwear?

Do men get night sweats too?

What top goes with them?

How to care for Kottinu

Where it is made

Size guide

30 nights to fall in love with it

The 3 AM test: cotton or NightCool?

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More NightCool to explore

Robes and accessories

Customer Reviews