Double D-Ring Belts
Double D-Ring belts are an inexpensive, lightweight belt manufactured using 1" polypropylene webbing and acetal D-Rings. There is noting on this belt which would set off a metal detector. The combination of polyproplyene webbing and the plastic D-rings give the belt excellent grip. If the shortest length is too long you can always cut it off and heat seal the end for a perfect fit.
I like to use these on my mountain bike shorts. The light weight and the fact they don't soak up water is nice on the trail. If I forget to take it out before throwing the shorts in the washer, the plastic D-rings don't get me in trouble.