Change what you wear when it’s hot.

Polartec® Delta™ was created so cooling fabric technologies can better utilize the body’s natural cooling process — sweat. Next-to-skin fabrics that target wicking and drying only keep moisture vapor moving, and don’t work to actually solve overheating. Delta works harder and smarter by elevating yarns for increased airflow, optimizing moisture dispersal, and reducing friction against the skin.

  • Cool Touch
  • Superior wicking action
  • Highly breathable
  • Reduced skin cling
  • Regulated drying
  • Odor control
Best Uses
  • Cooling Next-To-Skin base fabric.
Delta™ Technology Image


Polartec® Delta™ is engineered with elevated structures knit across the fabric surface to increase airflow, reduce friction, and dissipate heat. This specialized knit construction is enhanced with a hydrophobic and hydrophilic yarn blend for advanced moisture management. Delta’s innovative fabric composition regulates dry times and allows breathability when wet. By working in sync with the body’s natural cooling response, Delta™ outperforms other base fabrics in hot conditions.


Mountain Hardware