Active Stretch Thermals - Midweight Warmth

Cold-weather performance base layer for active use and reliable warmth. Ideal for performance sports or casual wear.

  • Fabric & Fit - Made from soft, comfort‑knit fabric composed of 86% polyester and 14% spandex (~180 gsm), the Active Stretch line offers four‑way stretch that hugs your body and moves with you for unrestricted performance. 
  • Moisture Control - Equipped with Acclimate Dry+ hydrophobic yarns, this collection quickly wicks sweat away from the skin to help you stay both dry and warm while preventing overheating. 
  • Warmth Level - Designed as a midweight thermal layer, it delivers moderate warmth—ideal for layering under jackets or wearing alone in brisk weather without feeling bulky. 
  • Construction Details - The flat-seam stitching enhances durability and comfort, minimizing irritation while preserving stretch and fit.

6 products

  • Acclimate Dry Icon

    Acclimate Dry +

    • Moves moisture away from the skin to keep you dry
    • Promotes faster drying during and after activity
    • Helps regulate body temperature in changing conditions
    • Designed for cold-weather performance layering
    • Dries faster than standard cotton or untreated fabrics
    • Reduces clamminess during active use
    • Not waterproof; designed for moisture management, not rain protection
  • Four way stretch

    Four-way Stretch

    • Four-Way Stretch: Moves in all directions for unrestricted mobility during active use
    • Shape Retention: Maintains fit and structure through extended wear and repeated movement
    • Layering-Friendly: Designed to sit smoothly under outer layers without bunching



  • Polarmax Warmer Icon

    Active Stretch Midweight Warmth

    86% Polyester, 14% Spandex; 180 gsm

    • Relaxed Fit
    • Cold temps
    • Active use
    • Balance of warmth + moisture management
    • Warmer than typical lightweight synthetics
    • Less bulky than traditional heavyweight thermals

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