Hard hat ID w/ data windowManufactured By: Vital IDSize: 3.25" x 0.75"Easily fitted to the exterior of worker's hard hat and securely stores critical and potentially lifesaving ID information essential in the event of a serious accident or medical emergency.Lightweight and 100% waterproof.Features 3M Scotchlite reflective material.Can also be fitted to clothing and other work equipment such as harnesses.Model WSID-02 features a data/name window for displaying information without opening sleeve.Both models feature a security seal to keep the worker's information secure."Helmet safe" adhesive used to fix unit to helmet.