Flex Belt

M39 Flex Belt

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  • M39 Flex Belt
  • Flex Belt
  • Flex Belt
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Look your best the whole game with this highly practical, stretchable rubber Flex Belt / hidden shirt tailer. It fits around your hips over your umpire or referee 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 Creme or Grey


  1. Put on your umpire or referee shirt and, before pulling up your pants, place the flex belt over your shirt just below where your pant's waistband will go. The smooth side should be against your shirt 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.

Product Video

Flex Belt Instructions from Manufacturer Hero's Pride

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Customer Reviews



Evanston, IL

July 30, 2019
Works great, but REALLY tough to buckle. Maybe I just need to hit the gym.

Edward P.

Clayton, N.C.

June 24, 2019
I bought this shirt stay this year. Worked awesome. Not 1 time did my shirt pull up once tucked and the band put in place. This shirt stay will help any umpire keep a professional tucked in look. Best of all, you don't even know that you are wearing it. Simply put, this is a must have in your equipment bag.

Bob M.

Clarkston, MI

June 8, 2019
I've had both the white one and now this gray one. Extremely stiff when new. Hope it gets easier to use with use.

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