10 Best Union Suit of December 2025

• 5.5 oz, 1X1 Rib Knit fabric for lightweight, one-piece warmth
• Rib cuffs for added protection from cold, tagless label
• Full button from with one button vertical rear seat
• To avoid excessive shrinkage during laundering, wash with cold water
• Rated for cold weather and medium activity
• Traps & Retains Body Heat
• 1x1 Rib Knit
• 100% Combed Cotton For Warmth And Comfort
• Rated for Cold Weather Medium Activity

Indera

• What You Get: A Terramar Sports Men's Union Fleece Stretch comfort Zip Suit that comes in all Black and available in the sizes: X- Small, Small, Medium, Large, X-Large. For a more relaxed fit, order a size up!
• Made from a 100% Polyester, it creates an extremely comfortable and soft base layer full body suit meant for all day use during the cold winters! Ideal for outdoor riding, hunting ,hiking, skiing, snowboarding, Snowshoeing, and outdoor activities.
• Features: Thermoregulation Terramar Sports Technology that keeps you comfortable in all conditions and engineered to adjust to your body temperature due to our custom ClimaSense technology that helps control your body temperature!
• ClimaSense is a propriety fabric technology formulated to adapt to an active body’s changing physiology. A number of factors influence the skins surface temperature. Key among them are the outside weather conditions and the activity level.
• How to Wash: Washer and dryer safe! Machine wash cold with like colors and only non-chlorine bleach when needed. Tumble dry low. Do not iron. To keep it in perfect shape for as long as possible, we recommend hang drying.

Terramar

• 5.5 oz, 1X1 Rib Knit fabric for lightweight, one-piece warmth
• Rib cuffs for added protection from cold, tagless label
• Full button from with one button vertical rear seat
• To avoid excessive shrinkage during laundering, wash with cold water
• Rated for cold weather and medium activity

Indera

• Two-layer engineering with Merino Wool, traps body heat between layers, resulting in chill-blocking warmth
• Full button front with horn style, branded buttons
• Single button vertical rear drop
• Tagless labeling for extra comfort
• Fits loose on the body, generous cut for full range of motion. For best fit wash before wearing
• Best for dressing with minimal layers in very cold to extreme cold weather and low to medium activity

ColdPruf

• 5.5 oz, 1X1 Rib Knit fabric for lightweight, one-piece warmth
• Rib cuffs for added protection from cold, tagless label
• Full button from with one button vertical rear seat
• To avoid excessive shrinkage during laundering, wash with cold water
• Rated for cold weather and medium activity
• Traps & Retains Body Heat
• 1x1 Rib Knit
• 100% Combed Cotton For Warmth And Comfort
• Rated for Cold Weather Medium Activity

Indera

• One-piece thermal union suit made from U.S. sourced cotton and recycled polyester

Fruit of the Loom

• Long-sleeve coverall in two-layer thermal featuring full-button placket and crew neckline with tagless label

Duofold

• Waffle knit traps heat and smooth flat lock seams and tagless label enhance comfort
• Rugged flex technology for ease of movement
• Snap-button front, concealed thumb loops and concealed dry low-stitch waistband
• Strategic seam placement for maximum comfort and reduced chafing
• Back opening with elastic waistband Tuck closure

Carhartt