- Polartec® Power Grid™ fabric with Polygiene® permanent odor control has a smooth face for easy layering; Fair Trade Certified™ sewing. - Fabric’s open-grid pattern next to skin provides superior warmth, breathability, and moisture-wicking performance - Spandex for stretch and ease of movement - Flat waistband has brushed inner elastic for next-to-skin softness - Gusseted crotch for comfort and unimpeded mobility - Flatlock seams to minimize chafing