Not for hardhats - Energizer Aluminum Alloy Lithium 3 AA Weatherproof LED Headlight w/ Batteries

These are great lights for hunters, etc. I bought on for construction, to wear on my hardhat. The headband(s) expanded plenty, but the cord was too short to center the battery pack on the rear of my hardhat. Usually there's some coiled slack in the cord, along the head band for large adjustment, but not with this one. It was useless to me, so I gave it to my daughter, She's an avid hunter.
Pros: Great light
Cons: Cord is 4" shorter than headband

This review was written in the old system and had content requirements that are different than reviews written today.