Bi-Ply Crewneck Base Layer – Men's

When temperatures drop and you need a reliable first layer without the bulk, the Bi-Ply Crewneck is our pick for cold-weather trail runners and outdoor athletes. Its two-layer spun polyester construction traps air between the layers for midweight warmth, while MTF moisture management pulls sweat away so you stay dry on the move. Flat-lock seams eliminate hotspots under a pack or harness.

• Two-layer air-trapping construction delivers midweight warmth (Warmth Factor 7) without the bulk of heavier fleece
• 100% spun polyester double knit feels soft against skin — closer to cotton than traditional synthetic baselayers
• MTF moisture management moves sweat away from the body to keep you dry during active output
• Relaxed fit layers cleanly under a mid or shell without bunching or restricting movement
• Flat-lock seams run smooth against skin, reducing friction and irritation on long days in the field