The HPG Prairie Belt is a nod to the prairie belts of old worn by the US cavalry. First and foremost it is a very comfortable and capable backpack waist belt. However, it is also designed to be equally useful as a stand alone load bearing belt -- what is called a "battle belt" nowadays.
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Prairie Belts are sized on the basis of your jeans waist size (which is not the same as your actual waist measurement). In each case, the size is the belt with both pads installed, mounted in a Ute backpack, with the belt cinched fully closed. So, our "33+" will snugly fit someone who wears a jeans size 33, have about an inch of play for someone who wears 34, and so on. Bear in mind that removing pads, particularly the thickest of the two included pads, will make the Prairie Belt grow in size an inch or two.
All sizes have a lot of adjustment webbing in front, so there isn't much of an upper limit to any of them, except that you want the padding to at least wrap past the front of your hip bones. You can go backwards into your minimum comfortable size by measuring the distance between the fronts of your hip bones, subtract 2 inches to get maximum comfortable expansion and subtract that number from your pants size. So, if your hip bones are 10" apart in front - call it 8" to allow for padding past them - and you wear size 38 pants, you could get away with anything over a 30+. On the other hand, more padding in front doesn't hurt and gives you more PALS real estate. Going in that direction, the smallest you would want to go would probably be a 36+.