Bi-Ply Bottom Thermal Baselayer – Men's

When temperatures drop and you need reliable warmth under your work pants or hunting layers, the Bi-Ply Bottom is our go-to midweight baselayer for men who don't mess around with the cold. Double-layer spun polyester traps air between the two layers for serious insulation, while MTF moisture-transport fibers keep sweat off your skin. Flat seam construction and a plush elastic waist mean you can wear these all day without thinking about them.

• Warmth Factor 7 midweight rating — double-layer construction traps air between two spun polyester jersey knit layers for genuine cold-weather insulation
• MTF fibers actively move moisture away from skin, so you stay dry whether you're working hard or standing still in the cold
• Flat seam construction eliminates pressure points and chafing under outer layers — critical for long days on your feet
• Relaxed fit with fly front layers cleanly under jeans, work pants, or hunting bibs without bunching or riding up
• Plush-back elastic waistband stays comfortable all day and holds its shape wash after wash — available in black, sizes S–XXL