The Sportful R&D Bib Tights were born from new insulation materials and all the best features from Sportful's other clothing lines. What you'll experience is unbelievable warmth and breathability in freezing temperatures. Advanced high-loft, dual-layer fleece front exterior with hollow core polyester interior retains heat, wicks moisture and feels great against your skin. ThermoDrytex PL+ fabric on thighs and knees adds further warmth while the ThermoDrytex+ fabric on back moves with you for ultimate comfort. TC Pro chamois is anatomically designed, moisture-wicking and uses minimalist variable thickness padding to absorb road vibrations. Reflective ankle zips increase visibility in low light or dark conditions.