COMPATIBILITY: Fits all Petzl VERTEX and STRATO helmets manufactured from 2019 onwards. FOAM REFILL ONLY: Contains the textile comfort foam padding only; designed to velcro directly onto your existing headband rim (plastic rim not included). CHOOSE YOUR STYLE: Available in "Standard" (closed-cell foam that is easy to wipe clean) or "Absorbent" (breathable open-cell foam that soaks up sweat). MACHINE WASHABLE: The Absorbent version is breathable and can be machine washed to maintain hygiene; the Standard version wipes clean instantly. EASY REFRESH: The most cost-effective way to refresh a sweaty or dirty helmet to ensure all-day comfort.