First-Of-It's-Kind Hat Liners

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The Best Sun Protective UPF50/50+ Apparel & Accessories

Outlast the Sun with Sundercover®

Hat Liners

Invisible Protection. Everyday Comfort.

UPF50+ Sundercover Signature Hat Liners

Our First-Of-It's-Kind UPF50+ Hat Liners turn your hats into powerful sun-protection gear. Engineered with lightweight, breathable fabrics, they block over 98% of harmful UVA and UVB rays—maximum sun defense without changing your look or comfort.

The Round Liner is ideal for fitted baseball caps, fedoras, bucket hats, women’s sun hats, and more—featuring an OSFM adjustable design for a secure, customized fit- while the Cap Liner is made for adjustable baseball caps and comes in several sizes to fit most caps.