Flex Belt

M39 Flex Belt

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  • M39 Flex Belt
  • Flex Belt
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(Contiguous U.S.)


Look your best the whole game with this highly practical, stretchable rubber Flex Belt / hidden shirt tailer. It fits around your hips, in between your umpire or referee shirt and under apparel shirt, and inside your pants or shorts to keep your shirt securely tucked in. The Flex Belt helps the shirt resist pulling up while also helping to keep the slacks from sagging down.


  • Comfortable and durable soft rubber
  • Increased button diameter to resist pull-through
  • Reinforced end for extra durability not found on flex belts from other manufacturers
  • Lightweight 3.3 ounces
  • Flex belt is one size fits most (Length is 44" and stretches to 46").
  • Available in Grey


  1. Put on your under apparel shirt, before pulling up your pants, place the flex belt over your under apparel shirt just below where your pant's waistband will go. The smooth side should be against your body with the pegs pointing out. 
  2. Stretch 1-2 inches to pull tight.
  3. Place the button in a hole in a middle row.
    (Note: the trick is that when stretching the belt, place the button through a hole that has been stretched length-wise making it much easier to button than if you had not stretched the belt.)
  4. Once buttoned, trim to the desired length leaving 4" for overlap.
  5.  Put on your uniform shirt over the Flex Belt and pull up your pants to fasten them with uniform shirt tucked, being held in place by the pegs of the Flex Belt and the pressure from your pant waistband. 

Product Video

Flex Belt Instructions from Manufacturer Hero's Pride

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Official Reviews

October 18, 2023   Verified Purchase
Very pleased with the quality. Always great service from Ump Attire!
August 28, 2023   Verified Purchase
I love this product. I use it for Football and even throwing flags and beanbags constantly, my shirt stays tucked in.
May 18, 2023   Verified Purchase
The Flex Belt was exactly what I was hoping for. Since dropping a few pounds, keeping pants up and shirts tucked in was a problem. This works great to do both! However, I did have two issues: 1) I originally adjusted it too tight, and getting it on/off was difficult. The stud that adjusts the length separated. 2) The extra 'tail' after adjusting the belt size cleverly overlaps and meshes together. However, you have to 'stretch' the belt to get them to fit back together each time you take it off. Not difficult, but still a nuisance. A few drops of instant glue mended the stud and glued the 'tail' in place. Now, I am VERY pleased with this belt!

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