Minus33 bright red Union Suit in midweight Merino wool with button front and thumbholes

Person in red Union Suit Merino Wool base layer, standing by a window with skis and a backpack.

Man holding a mug wearing a red merino wool union suit in a bright, cozy setting.

Customer review of Union Suit: "Negates fluctuating temperatures and zero cold chills from sweating." - Chad F., 5 stars

Union Suit Merino Wool- Midweight Base Layer

$179.99

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The Union Suit Merino Wool Midweight Base Layer combines a timeless design from 1868 with modern merino performance. With a drawstring waist, button-up torso, and snap bottom, it’s easy to adjust for comfort whether you’re layering for the outdoors or relaxing at home. Thumbholes add extra warmth, ribbed ankle cuffs keep everything in place, and the bright red color makes a bold cold-weather statement. Keep it performing season after season with Nikwax Wool Wash.

Color Palette

Winter Palette – Bold bright red with cool undertones, perfect for adding color to winter layering without sacrificing function.

Fabric + Features

Fiber Content: 100% Merino Wool
OEKO-TEX® STANDARD 100 Certified
Woolmark® Certified
Responsible Wool Standard® (RWS) Certified
Knit: 235 g/m² Midweight Interlock Knit
Microns: 18.5 Micron Fibers
UPF Rating: 50+
Total Easy Care: Machine Wash and Dry
Button-Up front torso with snaps on lower half (extra button included)
Rear Opening: Low profile, snap opening
Henley Y-Neck