Specially designed polyester fiber structure effectively absorbs and evaporates sweat quickly, maintaining dryness during intense workouts or hot weather outdoor activity Craft from polyester with air permeability, this helmet liner keep your head cool and drying during prolonged wear for cycling, skateboarding and other helmet required activity Crafted from recyclable polyester that production, meeting modern environmental standards while providing high for consumers Polyester materials reduces overall helmet weight by 30%, minimizing neck strain for extended wear comfortable, particularly suitable for children and women users The polyester materials allows simple hand or machine washing to remove sweat, ideal for daily commuters and sports enthusiasts who frequently use helmets