Performance Short With Built-In Jock
A premium athletic short with a four-strap jock built inside. The straps hold your cup snug against your body, and the short ends just above the knee. Nothing to layer underneath. Cup sold separately.
Shift-proof quad strap design keeps the cup locked in place
Athletic cup: polycarbonate shell with a soft elastomer rim (Sold Separately)
Free U.S. shipping on orders over $175. Ground, 2-Day and Overnight options at checkout.
30-day returns and free exchanges. Add Checkout+ at checkout for free returns and package protection.
Lifetime warranty on the athletic cup.
Short size guide
Measure around your natural waist, just above the hips. Don’t go by pant size.
| Size | Waist | Weight (approx.) |
|---|---|---|
| Small | 28–30" | 140–170 lb |
| Medium | 31–33" | 170–200 lb |
| Large | 34–36" | 200–230 lb |
| X Large | 37–40" | 230–270 lb |
Built for a snug, supportive fit. Between sizes? Athletes with bigger thighs or glutes usually size up. Leaner builds may prefer the closer fit. The waistband has a drawstring. Full size chart
Cup size guide
| Cup | Length | Width | Depth |
|---|---|---|---|
| Youth | 5.5" | 3" | 2" |
| Adult | 6.75" | 4" | 2.25" |
Most athletes move to the adult cup and adult sizes around age 12, depending on build.
Description
Premium Performance Shorts With Built-In Shift-Proof Groin Protection
The Diamond MMA Performance Short Jock System is our most complete protection. It’s a premium athletic short with our quad strap jock built right inside, so you get the short, the jock and the cup in one piece.
Four straps inside the short hold the athletic cup snug against your body, pulling the cup pocket tight from four directions. On the outside, it’s a clean, stretch athletic short that ends just above the knee. Nothing to layer underneath. Pull it on and go.
Most jock straps and compression shorts leave room for the cup to shift, ride up or bunch when you move. The Performance Short Jock helps keep it centered and in place through sprints, slides, kicks and scrambles, so you stay focused on the game, not on adjusting your cup.
Built for athletes who train hard and compete harder: MMA, Muay Thai, jiu jitsu, baseball, hockey, football, lacrosse, motocross and tactical training. Serious protection that moves the way you do.
What’s included
One Performance Short with the built-in jock. The cup is sold separately. 2pk and 3pk add extra shorts.
Shipping & returns
Orders are processed and shipped within 1–3 business days. We don’t ship on weekends or major U.S. holidays, so a Friday order usually ships the following Tuesday. Delivery time starts once your order ships. See our full shipping policy →
- Shipping is calculated at checkout, with Ground, 2-Day and Overnight options.
- Free shipping on U.S. orders over $175.
- Returns are accepted within 30 days of delivery, even on worn or used gear.
- Exchanges are free on every order.
- Add Checkout+ at checkout for free returns and package protection.
- Refunds go to your original payment method or store credit, your choice. Allow 5–7 business days once we receive the return.
- Shipping fees aren’t refundable once an order ships.
Size chart & fit guide
Diamond MMA Size Chart
Size every Diamond MMA jock, short and brief by your waist, measured just above the hips. Not your pant size. Athletic cups come in Youth and Adult, and most athletes move to the adult cup around ages 14 to 15.
Start here
How do I measure for a jock or compression short?
It takes about a minute with a soft tape measure.
Find your natural waist
It's just above your hip bones, usually a little above your belly button.
Measure around
Wrap the tape around your body, level and snug, but not tight. Don't go by your pant size.
Match the chart
Find your waist in the chart for your product. Weight ranges are there to help if you're on the line.
Athletic cups
What size athletic cup do I need?
Our athletic cup comes in two sizes. Both use the same polycarbonate shell and soft rubber elastomer rim. Pick the one that covers fully without pinching at the edges.
| Cup | Length | Width | Depth |
|---|---|---|---|
| Youth | 5.5" | 3" | 2" |
| Adult | 6.75" | 4" | 2.25" |
When to move up: most athletes move from the youth cup to the adult cup around ages 14 to 15, depending on body type. If the youth cup no longer covers everything, it's time.
Adult
Quad Strap Jock & Compression Jock Short size chart
Built for a snug, supportive fit. Adult sizes have a drawstring waistband.
| Size | Waist | Weight (approx.) |
|---|---|---|
| Small | 28–30" | 120–150 lb |
| Medium | 30–32" | 140–170 lb |
| Large | 32–34" | 160–190 lb |
| X Large | 34–36" | 180–220 lb |
| 2XL | 36–40" | 210–260 lb |
| 3XL | 41–44" | 250–300 lb |
Fits: Quad Strap Jock System · Quad Strap Jock · Compression Jock Short System · Compression Jock Shorts
Youth
Youth jock & compression short size chart
Youth sizes don't have a drawstring, so measure carefully. Outgrown Youth X Large? Move to adult Small.
| Size | Age (approx.) | Waist |
|---|---|---|
| Youth Medium | 8–10 | 22–24" |
| Youth Large | 10–12 | 24–26" |
| Youth X Large | 12–14 | 26–29" |
Fits: Youth Quad Strap Jock System · Youth Compression Jock & Athletic Cup System · Youth Compression Jock Short System | White
Hockey
Hockey jock short, garter & jock pant size chart
Our hockey line runs Small to 2XL. Between sizes, or thicker in the thighs or seat? Go up a size.
| Size | Waist | Weight (approx.) |
|---|---|---|
| Small | 28–30" | 120–150 lb |
| Medium | 30–32" | 140–170 lb |
| Large | 32–34" | 160–190 lb |
| X Large | 34–36" | 180–220 lb |
| 2XL | 36–40" | 210–260 lb |
Fits: 3 in 1 Hockey Garter Belt · Hockey Jock Short System · Hockey Jock Short · Cut-Resistant Hockey Jock Short System · Cut-Resistant Hockey Jock Pant System
Performance Short
Performance Short size chart
The Performance Short runs on its own chart, Small to X Large, for both the built-in jock and built-in brief versions. The waistband has a drawstring.
| Size | Waist | Weight (approx.) |
|---|---|---|
| Small | 28–30" | 140–170 lb |
| Medium | 31–33" | 170–200 lb |
| Large | 34–36" | 200–230 lb |
| X Large | 37–40" | 230–270 lb |
Fits: Performance Short With Built-In Jock System · Performance Short With Built-In Jock · Performance Short With Built In Brief
Briefs
Compression Brief & Sports Boxer Brief size chart
Both briefs share one chart. They're made for support on days you don't need a cup. Size down for more compression, or size up for a more relaxed everyday fit.
| Size | Waist | Weight (approx.) |
|---|---|---|
| Small | 28–30" | 130–155 lb |
| Medium | 31–33" | 155–185 lb |
| Large | 34–36" | 185–215 lb |
| X Large | 37–40" | 215–250 lb |
| 2XL | 41–44" | 250–290 lb |
Fits: Compression Brief · Sports Boxer Brief
Fit tips
Between sizes?
Bigger thighs or glutes
Size up. The quad straps and leg openings will sit more comfortably.
Leaner build
Take the smaller size for a closer fit that holds the cup tighter.
Wrong size?
Exchanges are free on every order. Start one in the returns portal.
Apparel
Rash guard & T-shirt size charts
Questions
Sizing questions
How should an athletic cup fit?
It should cover everything, sit flat against your body and stay put when you run or squat. If it gaps at the edges or pinches, try the other size.
Should I go by my pant size?
No. Measure around your natural waist, just above the hips. Pant sizes vary by brand and usually sit lower on the body.
When should a youth athlete move to the adult cup?
Most athletes move from the youth cup to the adult cup around ages 14 to 15, depending on body type. If the youth cup no longer covers everything, it's time to size up.
Can I get a youth cup with an adult jock?
Yes. Our adult Systems let you choose the adult or youth cup, which works well for teens and smaller-framed athletes.
What if I'm between sizes?
Athletes with bigger thighs or glutes usually size up. Leaner builds may like the smaller size for a closer fit. Exchanges are free if you need to swap.
What if it doesn't fit?
Exchanges are free on every order. You can also return it within 30 days of delivery. Start through our returns portal.
Still not sure?
Answer a few questions and we'll match you to the right jock, cup and size for your sport. Or email info@diamondmma.com and our team will help.
Product details
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Description
Four straps built into the inside of the short hold the cup snug against your body. They pull the cup pocket tight from four directions, so it stays put when you sprint, slide, kick or scramble.
On the outside, it’s a stretch athletic short with a drawstring waistband that ends just above the knee. Wear it on its own for training, practice or game day.
The cup pocket is tailor-fit to the Diamond MMA High Performance Athletic Cup.
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Materials & care
Short fabric: 82% nylon / 18% elastane
Jock straps: Four 1" non-roll elastic straps
Waistband: 2" jacquard knit logo elastic with drawstring
Leg openings: 1.5" non-roll elastic
Care: Machine wash cold. You can leave the cup in the pocket and air dry both, or wash the cup by hand. -
Warranty
Every Diamond MMA athletic cup has a lifetime warranty. Every other Diamond MMA product, including the jock short, has a 30-day warranty.
Problem with your gear? Fill out the Warranty Claim Form.
How does a performance short with a built-in jock keep a cup from shifting?
Most compression jock shorts just have a cup pouch, which leaves the cup floating around. The Diamond MMA Performance Short Jock has a cup pocket tailored to the Diamond MMA cup, plus four straps that pull that pocket tight from four directions. That tension helps keep the cup snug against the body when you sprint, change direction, slide or hit the mat. The athlete should be thinking about the game, not adjusting their cup.
Protective gear helps reduce risk but can’t prevent every injury.
Safety & product disclaimer
Built to stay in place through every play
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Shift-proof quad strap design
Patented four-strap stabilization helps keep the cup centered and secure, so you’re not stopping to fix it mid-game.
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Tailor-fit cup pocket
The pocket is cut to fit the Diamond MMA cup, so there’s no extra room for it to slide around.
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Athletic cup protection
A polycarbonate shell with a rubber elastomer rim. The shape helps deflect and spread the force of a hit. Lifetime warranty on the cup.
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One system, every sport
Baseball, football, lacrosse, wrestling and combat sports. Adult and youth sizes, so the whole team gets the same locked-in fit.
Frequently asked questions
What size Performance Short Jock should I get?
Measure around your natural waist, just above the hips, and match it to the size guide: Small 28–30", Medium 31–33", Large 34–36", X Large 37–40". Between sizes? Athletes with bigger thighs or glutes usually size up. Leaner builds may prefer the closer fit.
Which should I get: the Quad Strap Jock, Compression Jock Short or Performance Short?
All three use the same four-strap design and tailor-fit cup pocket. The difference is what’s built around the jock.
Quad Strap Jock: A traditional jock strap you wear under your own shorts, pants, or uniform.
Compression Jock Short: The Quad Strap Jock with a compression short built around it. The two front straps sit inside the short, and the two back straps are built into the short. It ends about mid-thigh.
Performance Short With Built-In Jock: Made to wear as your outer short. All four straps are inside, and it ends just above the knee.
Can I wear it as my regular training short?
Yes. It’s made to be worn as an outer short. All four straps are on the inside, and the short ends just above the knee, so you can train, practice or compete in it without a separate jock underneath.
Should my kid wear a youth or adult cup?
The youth cup is 5.5" long, 3" wide and 2" deep. The adult cup is 6.75" long, 4" wide and 2.25" deep. Most athletes move to adult sizes around age 12, depending on build.
Can I wash the jock with the cup inside?
Yes. Machine wash the jock in cold water with the cup left in the pouch, then air dry both. You can also wash the cup by hand.
Do the 2pk and 3pk come with extra cups?
No. Multipacks add extra jock shorts. You get one cup with the system.
How much is shipping?
Shipping is calculated at checkout, with Ground, 2-Day and Overnight options. U.S. orders over $175 ship free.
What if it doesn’t fit?
Exchanges are free, so you can swap for the right size. You can also return it within 30 days of delivery, even if you’ve worn it. Add Checkout+ at checkout for free returns and package protection.
What does the warranty cover?
The athletic cup has a lifetime warranty. Every other Diamond MMA product, including the jock short, has a 30-day warranty. Fill out the Warranty Claim Form if you have a problem.
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