Fruit of the Loom

Fruit of the Loom mens Premium Thermal Union Suit

186+ bought in the past month

$28.99$34.99
size6
$28.99
Was $34.99Save $6.00

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Technical specifications

departmentmens
date_first_availableApril 15, 2025
best_sellers_rank#13,894 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #2 in Men's Thermal Underwear Union Suits

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Customer reviews

4.53,680 ratings

Customers say

Customers find the union suit keeps them warm in cold weather and appreciate its comfort, quality, and value for money.

★★★★★

Love it

AbeJanuary 7, 2026

Love my onesie, it fits nicely and is warm Read more

★★★★★

Very comfortable!

Scooter's AdventureDecember 30, 2025

I really like this it's warm and comfortable to sleep in and to lounge around the house in Read more

★★★★★

Great for layering, they run very long

FlashOctober 28, 2025

Good base layer for cold weather if you don't like extra layers in waist from seperate top and bottom. These are not fleece pajamas to keep you cozy around the house when worn by themselves although they're good for sleeping in a cool room with blankets. I'm 6' 190lbs muscular build, size chart recommended a large, it was too long and loose. Returned for a medium and I'm happy, fits as a base layer should with a little stretch. Read more

★★★★☆

The Union Suit used to be very popular for important reasons

ContributronJanuary 16, 2024

My preference would have been for 100% natural fiber, but this cotton-poly blend is actually quite nice against my skin. In my ongoing quest to free my waist from binding, this feels so relaxing. It's not heavy weight, but my core isn't split at the waist, so core heat has stayed cozy. Despite connecting in the middle, the stitch rather small and durable, and it opens plenty in the front and back for doing one's bathroom business. Speaking of, if one would like to feel very cozy and warm while doing said business, one probably would like this. At this cost, maybe just try it. Here's why it didn't rate 5 stars for me. It is sewn together at the very center of the crotch. The buttons at the bottom are not easy to feel. 5 stars would have been given to: 100% cotton; completely unbuttons at bottom; and buttons are snaps. Then again, the only similar garment I found with those qualities goes for over $100, and would have to be imported from the UK, so...yeah. Read more

★★★★★

Great!!!

Michelle Zbacnik-MillerDecember 28, 2025

These are amazing and get my builder husband through winter WARM! Read more

★★★★★

Comfortable but...

Dakota SMarch 10, 2024

It's odd that different reviews picture different materials... the one I received was a jersey knit style fabric. The same type you would find in a cotton t-shirt. Not as insulating and warm as a waffle material, but great for having something in between waffle thermal and nothing at all. Fabric is breathable and has a typical stretch you would expect from a cotton t-shirt. Not as thick as I was expecting. All around very comfortable. But flap isn't large enough to use - so expect to be sitting half naked when using the john. Just not sure at what point they became so expensive. For the cost - I would probably go with a polyester thermal set for 1/4 the price. Read more

★★★☆☆

The Good, The Bad, & The Ugly

SirJoeyFebruary 8, 2024

First, I'm 5'11", & skinny. Bought this strictly for wearing at home. THE GOOD: Overall, pretty good fit, & comfy. Nice, small sleeve cuffs & ankle cuffs which fit my little needle wrists & ankles nicely. Unless you're a stick-man like me, however, they may be too tight. Arms & legs are plenty long enough! THE BAD: As others have mentioned, torso is WAY too long. Should be about 6-8 inches shorter. Because of all the excess material in the crotch area, it would all bunch up in pants if I wore it that way, but I only wear this as PJs, or under sweats around the house, so not a major issue, but would still be nice if proportions were better. Also, material is THIN! This is NOT thermal, by ANY means. It is basically, a t-shirt body suit. THE UGLY: Crotch WAY too low, as others have mentioned. And that horrible rear-end opening with one button! A traditional 2-button flap would be a HUGE improvement! That said, for me, it was not a major issue, as I'm only using this thing at home, so I had a seamstress sew the entire opening shut, & I don't mind peeling it down to use the toilet. Would I buy this again? Maybe, but only at about half the regular price. Read more

★★★★★

Your butt crack will be showing all the time

AJanuary 4, 2026

Don’t let these five stars fool you because your butt crack is gonna be showing all the time. Pro tip prank your friends on a work trip with these for a good laugh. I wish I had read the Amazon reviews before I bought these. Lesson learned, I may start up an only fans account dedicated to these longjohns. Read more

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