Squids 3388 Wrist ID/Badge Holder is designed for easy access and prevention of lost IDs and badges. A soft and breathable circular knit polyester material stretches to fit a range of wrist sizes, while a small pocket with zipper closure keeps small items secure. The clear window is made with durable vinyl for protection and long-lasting use. This arm band holder fits most ID badges or access cards measuring 3.75" x 2.75".