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The Cap Liner is one shaped for adjustable baseball caps with an exposed opening in the back. (This liner can be used in other hats, although sun protection will be limited to the area covered by the liner).


Machine Washable/Quick Drying

Made in the USA


Applicable tax and shipping will be calculated at checkout.


Fabric: Sundercover hat liners are made from certified UPF 50+ fabric. Black and Magenta: 80% Nylon/20% Spandex; White: Polyester Microfiber Birdseye Flatback Mesh

Cap Liner

  • Size Instructions
    Toddler/Youth (T/Y) This size fits best in youth and toddler hats as well as in Women’s Small hats. Approximately 18”-21” head circumference.
    One Size Fits Most (OSFM) As the size suggests, this liner fits in most adult OSFM hats. Approximately 21”- 23” head circumference.
    Large/Extra Large (L/XL)

    This liner fits in larger-sized Men’s hats

    Approximately 23”-25” head circumference.

    * Sundercover cannot guarantee that our liners will fit into every hat.

  • Shipping rates applied at purchase. Orders processed within 1-2 days and estimated shipping time is 3-5 business days, Express shipping option available. Returns accepted within 30 days if not completely satisfied with your purchase. Return shipping only covered on size exchanges.

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