Men's Heavy Weight Wool Onesie

$140.00 USD
20 reviews
Color: Grey Mixed

This full-button front features military insert shoulders and a "trap" door with button closure.

  • 80% Wool/20% Nylon
Made in Canada 🇨🇦

Wool is one of the oldest fibre types used here at Stanfield’s and one that has certainly proven it can stand the test of time.

To get the longest and most vibrant life out of your wool garments there are some additional steps to add to your normal laundry routine.

In general, we recommend washing in cold water (30°C), laying flat to dry and to reshape the layer(s). This will allow the fibres to recover to their original shape and bring out the best of the natural resilience and spring of wool. Do not bleach your wool.

Once your wool is completely dry, it can be aired out inside or outside for a fresh new start. We recommend gently folding and storing your knitted wool garments in drawers as a best practice.

Your wool can be machine dried but does run the risk of shrinking if done. We always recommend laying flat to dry whenever possible. If you choose to iron your wool, always do it at a low temperature (never exceeding 110°C). For professional dry-cleaning, dry-clean, normal cycle, any cycle other than trichloroethylene.

But what about moths? If you are storing your wool long-term and not using regularly or storing in your daily-use closet, there are precautionary steps you can take to best store your garments. Food stains and body oils can attract moths. Before long-term storage, ensure your garment is clean and always store in airtight bags or containers. You may also choose to apply a moth repellent to your garments but remember not to place them directly on the garment.


We offer free shipping on all orders over $75 to Canada and the United States.

For international shipping please contact customer service at


If you are not 100% happy with your Stanfield’s purchase, we will give you a full refund on your purchase price.

Learn more.

Have a question? Reach out to our customer service team by email at or give us a call toll-free 1-855-895-9523

Or visit our contact page here.

Pre-dating Confederation, Stanfield’s was founded in 1856 by Charles Stanfield and blossomed during the Klondike Gold Rush as the premier manufacturer able to keep the gold panners warm and dry during the harsh Canadian winter climate.

Our commitment to quality, craftsmanship and to Canada is unwavering and continues to drive Stanfield’s into tomorrow through innovation, dedication and pride in being Canada’s brand. Yesterday’s story built for tomorrow.

Customer Reviews
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Filter Reviews:
John Z.
United States United States

Scratchy but worth it

Nothing better in the cold and wet than having the wool on. It’s my first pair of an all wool Union suit, but it was worth it to be warm in the cold damp rain and not be shivering. They’re my new go to anytime I’m out in the woods, will be ordering more. Thanks Stanfield’s!

LeRoy H.
United States United States

Men's heavyweight union suit

I'm now on my 4th set in the last 40 years. Great to wear during cold winters, whether in Oregon set winter weather or Montana's sub freezing temps. Won't be without them. Two thumbs up!

Canada Canada

wool underwear

using them for fishing

Brett D.
Canada Canada

So nice so cozy.

I have always lived in the Canadian prairies and at a certain age I just decided I was never going to be cold again. It started with buying really great socks for the first time and grew into all varieties of merino wool base layers and so on and so on. One thing that evaded me was always being cozy in my very old, not perfectly insulated, home when lounging around in the mornings. I know this onesie is going to be amazing for my many days working outdoors in the winter (I build and update billboards), but lately I've been rocking it with slippers and a housecoat and I couldn't be happier!

Jimme W.
United States United States

Best wool underwear

I have worn Stanfield union suits for over 40 years. This is the best heavy duty wool outfit ever made from my perspective. Canada produces the best wool garments. Originally found them at an outlet near Victoria BC, but had to resort to online searches recently, thank goodness you're still making them.

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Our Story

Charles E. Stanfield had no idea when he immigrated to Canada in 1855 that he would found the firm would become recognized as Canada's leading manufacturer of men's underwear. 

Find out how it happened