Diamond MMA Quad Strap Jock

STS-Jock Diamond MMA Quad Strap Jock Front View

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  • STS-Jock Diamond MMA Quad Strap Jock Drawstring
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The Diamond MMA Quad Strap Jock is the ultimate in groin protection for high-impact sports and umpires. It delivers highly effective groin protection without sacrificing comfort.

Designed by award winning designers and Stanford University engineers, the system has been approved by Doctors and Urologists.

Made from military grade elastics and premium construction, the Diamond MMA groin guard system leverages a high performance 4-strap jock system to hold a specially designed athletic cup in place within a perfectly tailored cup pocket. This patent pending system prevents both lateral and vertical movement of the cup. 

In combination with the Diamond MMA Quad Strap jock, the cup stays completely in place with dedicated straps to minimize both lateral and vertical movement. The Diamond MMA high performance cup is used by athletes, the US military, and, of course, umpires


  • Zero Cup Shifting: Quad-strap system keeps cup in place and held down when getting into your baseball or softball umpire stance
  • Elastic waistband with drawstring to provide custom fit
  • 82% Nylon, 18% Spandex
  • Cup NOT included, sold separately


  • Medium 31" - 34" (77 - 86cm)
  • Large 35" - 38" (87 - 96cm)
  • XL 39" - 42" (97 - 106cm)
  • 2X 43" - 48" (107 - 122cm)

Personal use item return policy

Product Video

Diamond Groin Shot Montage

Diamond MMA CEO, Craig Diamond, demonstrates there's no shot that the Diamond Cup can't handle & shares how their patent pending technology works to keep you protected.


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Official Reviews


Billy D.

Chamblee, GA

April 19, 2022
This is the first jock strap that I don’t feel the need to constantly adjust it during games.

John C.


February 23, 2022
As a bigger guy that has problems with supporters slipping down, this product with the pull string was perfect! It stays right where you put it for the whole game.

Michael V.

Abbeville, LA

July 28, 2021
Umpire here. Thought I might try this strap out after the need arose for a new one. I paired this with my Nutty Buddy and it fit and secured it like a dream. Took 3 shots off the cup in my 1st weekend. Two of them I felt nothing and the 3rd bounced up from under the catcher off some turf...put me down hard, but not as hard as if the cup was not there at all. 100% recommend this strap. Will look to get the Diamond MMA cup as well.

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Questions About This Product

Q: With this jock sizing do you recommend size range a bit bigger? I'm waist 34/35ish (covid gain). 31-34 or 35 mark.
– James Pascale

You will find a comfortable fit in the Large size(35-38). This jock features a drawstring in the waistband, which should eliminate any slack and not be as constricting as the Medium size (31-34) may be.

– Ty Unthank
Marketing Specialist, HS & College Umpire

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WARNING: Participants in any sports activity assume risk of injury. This equipment may be used to help aid in preventing or reducing the extent of injury. No equipment can guarantee umpire or player safety from injury during participation, and use of this equipment carries no such guarantee. Do not use any umpire equipment that is damaged in any way.