A "slim hair band" is a type of hair accessory that is noticeably thin or narrow. Unlike wide headbands, which are often used to make a fashion statement or cover a larger area of the head, slim hair bands are designed for a more subtle look or for specific functions like keeping hair out of the face during sports or workouts.

They are often made from elastic, plastic, or fabric and are popular for their ability to securely hold hair in place without adding much bulk. Slim hair bands are a versatile accessory for a variety of hairstyles and are especially well-suited for people with thin or fine hair, as they provide a secure grip without slipping. They can be found in various materials, from simple stretchy fabrics to elegant satin or decorated with subtle embellishments.