Browse men's thermal onesies and union suits by insulation weight and fabric, zip and button closures, hooded and footless designs, and fit for layering or sleep.
Pick your style
Classic Waffle Knit
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Cotton Ribbed
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Fleece Lined
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Henley Button Front
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Hooded Onesie
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Footed Union Suit
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Lightweight Base Layer
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Workwear / Rugged
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Warmth level?
Lightweight
Midweight
Heavyweight
Fleece-Lined
Features?
Button Front
Drop Seat
Hood
Footed
Full-Zip
Material?
Cotton
Wool / Merino
Synthetic Blend
Suggestions
Show me classic waffle-knit union suits
I want a fleece-lined one for very cold weather
Find merino wool union suits (lightweight base layer)