Keep your favorite hats sweat-free and looking crisp with this 10PCS pack of hat sweat liners and shapers. These felt hat inserts to keep shape are designed to absorb moisture while maintaining your baseball cap's form and structure. Use them as a baseball hat sweat liner, cap sweat protector, or general hat stiffener. Each piece can be trimmed to fit various hat types, including golf hats, tennis caps, fedora hats, and more. With 5 black and 5 white no sweat hat liners, you'll always have a fresh backup on hand. Perfect for daily use, gym, outdoor work, or hot summer days. Lightweight, reusable, and easy to clean—your hats stay dry, structured, and comfortable.