Diamond MMA Quad Strap Jock

STS-Jock Diamond MMA Quad Strap Jock Front View

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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


Fred S.


May 24, 2020
Comfortable and a pocket that holds the cup and minimizes movement. Definitely worth the money!!


Evanston, IL

July 30, 2019
I'd give this 11 stars if I could. The cup is great, but what really makes this system is the jock. I misplaced the jock a couple of weeks ago, so I've been wearing a traditional cup/jock combo that I wore when playing baseball, and it's like night and day. I never realized how uncomfortable a typical cup/jock could be, because I never knew how COMFORTABLE a cup/jock could be. I do now. Buy this. You could probably use a traditional banana-style cup that you have laying around, but I like the additional width that the MMA cup provides too, without being uncomfortable.

Tony N.

Ponte Vedra , FL

July 6, 2019
Great item. Worth spending the money on this system of support with their cup. Good protection and doesn't slide around at all. Very comfortable support.

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Questions About This Product

Q: Does the cup go into an actual pocket?
– Jory House

Yes, the Diamond MMA Quad-Strap Jock features a pocket to insert the Diamond MMA High-Performance Athletic Cup.

– Josh Mann
Marketing Assistant, Pro School Umpire Graduate

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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.