The 2nd Skull® Pro Cap was engineered with a $100,000 NFL grant as winner of the NFL HeadHealthTECH Challenge II.

Building on our original 2nd Skull® Protective Skull Cap, it delivers improved airflow and premium breathable fabrics for greater comfort. In NFL testing, the Pro Cap performed in the same heat-index category as skull caps and wraps that offer no impact protection at all.

Designed to fit comfortably under any helmet, the 2nd Skull® Pro Cap has been worn by professional players; including in Super Bowl LIV.

At its core is thin, 2mm XRD® Extreme Impact Protection. Flexible at rest, the material instantly stiffens under sudden pressure to help mitigate impact, while its low profile keeps helmet fitting seamless. The moisture-wicking fabric conforms to your head and keeps you cool.

Focus on your performance with the 2nd Skull® Pro Cap.

• Protective, Impact Absorbing Technology
• Designed to fit comfortably under most helmets 
• Multi-Sport: Football, hockey, baseball, lacrosse, softball and more
• Thin, ultra-lightweight design
• Moisture-wicking fabric to keep you dry
• Anti-microbial treatment to help prevent odor
• Permitted by NFHS for high school use in multiple sports 
• Hand wash only
• Made in the U.S.A.
• Fabric: 80% Nylon, 20% Spandex
  

• Youth: Circumference - 19''-21''
• Teen/Adult: Circumference - 21''-24.5''
• XL: Circumference - 24.5'' - 26''