NuttyBuddy Flex Athletic Cup

NB-FLEX NuttyBuddy Flex Athletic Cup Front Left Angled View

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  • NB-FLEX NuttyBuddy Flex Athletic Cup Front Left Angled View
  • NB-FLEX NuttyBuddy Flex Athletic Cup Front Left Angled View with Diagram
  • NB-FLEX NuttyBuddy Flex Athletic Cup Front View
  • NB-FLEX NuttyBuddy Flex Athletic Cup Left Side View
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  • NuttyBuddy Size Chart
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A baseball traveling at 90 mph can deliver 2,400 lbs of force. Other cups on the market can reduce that impact to 450 lbs of force—still enough to cause serious injury. The NuttyBuddy® Flex Cup has been proven in scientific tests to reduce that impact to just 110 lbs of force, which is within acceptable levels of impact.

A properly fitting cup shifts less, is more comfortable, and does not impede movement or performance. The unique, award-winning design of the Nutty Buddy Flex Cup more effectively and comfortably covers the male anatomy, while a full range of sizes - Hog, Trophy and Mongo - will help you achieve a perfect custom fit.

For those who need more give in their protective cup, go for the FLEX. Originally designed for MMA fighters, this cup is designed for even more comfort and flexibility.


  • Constructed of the same materials used in bullet-proof glass and military protective gear
  • Unique anatomical shape provides superior protection - a.k.a. Protecting the Boys®.
  • Flexible, rubberized edge for comfort and fit
  • Vented for additional comfort

In order to provide the utmost comfort and protection the Nutty Buddy, we recommend you wear your flex cup worn as a three piece system. To wear correctly, first put on compression base layer. Place jock and cup over the compression wear. Note: compression base layer and jock sold separately.



Cup Depth: 2.5"
Cup Length: 7.18" 
Cup Width: 4.35"
Body Height: 6'2" and up
Body Weight: 210 lbs and up


Cup Depth: 2.375"
Cup Length: 7.03" 
Cup Width: 4.11"
Body Height: 5'8” – 6'2"
Body Weight: 170 - 210 lbs


Cup depth: 2.25"
Cup Length: 6.83"  
Cup Width: 4.0"
Body Height: 5'4” – 5'8"
Body Weight: 130 - 170 lbs

UMPIRES: Learn How To Wear Your Nutty Buddy Cup & Jock System Like A Pro

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Personal use item return policy

Product Video

ESPN Nutty Buddy Video from Sports Science

Inventor Mark Littell tests the Nutty Buddy Protective Cup with a 90+ MPH baseball on Sports Science.


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Official Reviews


Fred B.

Fredericksburg, VA

September 8, 2022
Was suggested to me by our league's Umpire-In-Chief. While I usually hate wearing these, this one fit great. Gave me good unrestricted movement and didn't make me feel like I was too exposed. Must have!

Jonathan M.

Henryville, IN

May 16, 2022
Thought it was terrible uncomfortable because of the shape. Did not use. Cannot return.

Matthew M.

Indian Trail, NC

April 3, 2022
The Nutty Buddy Classic is a little more rigid on the sides than this Flex cup. The added comfort from this cup makes it my preferred choice, while the Classic now moves into my spare gear bag. Either option gives the best protection while keeping you in place throughout your game. I've worked four plate games in a row wearing the Nutty Buddy Flex and it didn't cause any discomfort even once. I can't say the same thing for the Shock Doctor cup I was using before I bought the Nutty Buddy system. This system is worth the investment.

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Questions About This Product

Q: When sizing this cup, what factor should be #1 to pick the right size? Height or weight?
– Douglas Duke

First consider weight and then body height. Try to get as close within the ranges without going over.

– Ben Kirk
Social Media Specialist

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NuttyBuddy, Inc. warrants that NuttyBuddy® athletic cup is free from defects and will reduce the risk of injury during normal playing conditions.

These warranties of merchantability and fitness DO NOT apply if: (1) The NuttyBuddy® athletic cup does not fit properly or is worn incorrectly, (2) is not consistently stored in a cool, dark location when not being used. (3) after one year from date of purchase, and (4) is used in any way other than for which it was designed.

Please inspect the NuttyBuddy® athletic cup for damage before each use and do not use if damaged in any way.

If the NuttyBuddy® athletic cup is proven to the satisfaction of NuttyBuddy, Inc. to be defective, NuttyBuddy Inc. will refund the cost of the product. Under no circumstances shall NuttyBuddy, Inc. be liable for any consequential or other damages in connection with the use of this product.