Here is another site for non-metalic construction boots.
Please note it is necessary to E-Mail customer Suppoort to ask if the model(s) you are interested in are Non-Metalic.
I have both the 8" Tactical Sport #2250 $85.99 (in the desert tan) and the 5" Tactical Sport #2262 $72.99 (in black). Both of which are non-metalic.
All of their boots are "Free Shipping" and no questions asked for returns.
I have to have a very wide boot (4E) and the Xtra Wide designation fits me just fine in the same size I wear in New Balance shoes.
No need to wear heavy socks or order one size to big or too small (my findings - your mileage may vary).
I have ordered a side zip model, but returned them as I did not see the "steel toe" notice (duh) on the description..
Ask Customer Support if their model #_____ is non metalic to clear metal detectors (they refer to airport type detectors and do not know much about our sport. So I gather from my C.S. contacts. Check out what the TSA Cops wear and you'll see Bates boots.
Great price and most boots are rated by military personell.
P.s. I have no interest in this company, except to say I use them and will continue to do so, due to proper customer handling, service and price. If you find otherwise, please post your findings to protect your detecting friends.