I had a thread here asking about helmets. I ended up with a Petzl Vertex as my construction helmet. For construction, sometimes I buckle it, sometimes I don't. It usually depends on if the dangling strap is getting on my nerves or not. That helmet saved me from a face plant in the woods a couple weeks ago. I didn't have it buckled, but it stays on *much* better than a regular hardhat, and the front of the helmet hit the ground instead of my face. It wouldn't have been a traumatic injury or anything, but I'll take no face plant over face plant every day of the week. Makes me more inclined to keep it buckled.