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The short answer
Size 4 is correct for U9 through U12 — AYSO lists it at 25.0–26.5 inches circumference and 12–14 ounces for the 10U and 12U divisions. That is a four-year span, making it the longest-serving ball you will buy. From about U12, a proper match ball becomes a genuinely better ball rather than just a pricier one.
Size 4 is the ball worth spending a bit of thought on, for a simple reason: it covers U9, U10, U11 and U12. Buy a good one when your kid is eight and it is still the right ball when they are twelve — which is a longer run than any cleat, sock or shin guard you will purchase in that period.
Start here
Pick by your kid’s level
The right answer changes with the level, not just the shoe size. Find your kid’s bracket and start there.
Tap any row to jump to the full write-up. The price in each button is the one Amazon reported on the date stamped under it — tap through for today’s number, which is the only one that can be relied on.
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Product
Best for
Surface
Fit notes
Price
1
adidas Starlancer ClubThe sensible default youth ball — right size range, right price, air stays in.
U6, U7–U8 rec, U9–U10, U11–U12, U13+ travel & club
Sizes 3, 4 and 5
Check the size on the ball, not the box: size 3 is for roughly U8 and under, size 4 for U9–U12, size 5 from U13..
Product photos come from each item’s current Amazon listing.
When does a better ball start mattering?
Around U12, and it is worth being specific about why — because below that, spending more genuinely buys nothing a kid will notice.
Age
What they notice
Worth buying
U9–U10
Whether the ball is inflated and round
Butyl bladder, decent carcass. Nothing more.
U11
Beginning to feel the difference in flight on a driven ball
Mid-range training ball
U12
Flight, consistency, how the ball takes a strike
A proper match ball starts to earn it
Scroll the table sideways on a narrow screen.
The mechanism is straightforward: a kid who cannot yet strike a ball cleanly and repeatedly cannot perceive inconsistency in how it flies. Once they can strike it properly, a machine-stitched rec ball starts feeling unpredictable by comparison. That crossover is usually somewhere in U11 to U12.
The size 4 span, level by level
[U9–U10](/levels/u9-u10) — 7v7 with a goalkeeper on a pitch around 55–65 yards. The ball is new at this level, having stepped up from size 3, and a rec ball is completely adequate.
[U11–U12](/levels/u11-u12) — 9v9 on a pitch around 70–80 yards. Same ball size, much bigger pitch and far more striking. This is where a better ball starts being worth it.
If your kid is about to make the jump up from size 3, size 3 vs size 4 covers what changes. If they are approaching U13, size 4 vs size 5 covers the next one.
Do adults use size 4 balls?
For practice, genuinely yes. Plenty of adults and coaches use a size 4 for close-control work, because the smaller target forces cleaner contact and makes the size 5 feel easy afterwards. It is a legitimate training tool rather than a kids' ball.
For a game, no — adult and U13+ matches use a size 5, and training exclusively on a size 4 leaves the strike feeling different when they switch back.
Two balls, still
The same logic as the younger ages, and it matters more once there is a good ball involved. One ball goes to training and games; one lives outside and gets left in the rain. Buying a match ball and then leaving it in the yard is the specific way to waste money in this category — match balls are built for flight consistency, not for a winter under a hedge.
A machine-stitched training ball like the adidas Tiro is the right ball for outside. The Select Numero 10 is not. Which brand to buy at which tier is a separate question, and best soccer ball brands for kids answers it.
Inflation, briefly
Check the range printed next to the valve on the ball and inflate to the middle of it. A size 4 has more air in it than a size 3, so it loses pressure more noticeably as it ages — check it monthly rather than waiting for a complaint. A properly inflated ball barely dents under firm thumb pressure. The full routine is on how to inflate a soccer ball.
1. adidas
adidas Starlancer Club
The sensible default youth ball — right size range, right price, air stays in.
Best for
The default rec ball at every size, U6 through U13+
Levels
U6 — first kicks · U7–U8 rec · U9–U10 · U11–U12 · U13+ travel & club
Type / surface
Sizes 3, 4 and 5
How it fits
Check the size on the ball, not the box: size 3 is for roughly U8 and under, size 4 for U9–U12, size 5 from U13.
What we like
Sold in all three youth sizes in the same model, so a family with two kids at different levels buys one thing twice
The butyl bladder genuinely does hold air longer — it is the difference between pumping weekly and pumping monthly
Cheap enough to own two so one can live in the car
Where it falls short
Machine-stitched seams are not as durable as thermally bonded ones and will eventually let water in
The printed graphics scuff off well before the ball fails
Manufacturer’s published specs
Machine-stitched construction with a durable polyurethane cover (adidas)
Butyl bladder, which adidas rates for better air retention than latex
Sold in sizes 3, 4 and 5
These are the manufacturer’s own claims, not measurements we took.
The one to buy if the ball is going to live in the yard rather than the gear bag.
Best for
A practice ball that lives outside, U7+
Levels
U7–U8 rec · U9–U10 · U11–U12 · U13+ travel & club
Type / surface
Size 4
How it fits
Size 4 is the U9–U12 match size. Confirm the size on the listing before buying — the colorways are listed separately and not every one carries every size.
What we like
Costs little enough that a ball lost over a fence is an annoyance rather than a replacement purchase
An adidas training ball rather than an unbranded one, so the cover and valve are to a known standard
Where it falls short
Heavier feel than a match ball, which is fine for practice and noticeable in a game
Listed in size 4 only, so it suits U9 upward rather than the youngest brackets
Manufacturer’s published specs
adidas's basic training ball, listed in size 4 (adidas)
Requires inflation on arrival
These are the manufacturer’s own claims, not measurements we took.
If most of the touches happen on a driveway rather than a field, filter on abrasion instead — best soccer balls for concrete covers the three specs that matter there.
One use case where the age-division size is not automatically the answer: juggling. A ball one size down gives more touches per minute while the technique is new, which is what best soccer balls for juggling is sorted on.
Common questions
What age is a size 4 soccer ball for?+
Roughly ages 8 to 12, covering U9 through U12. AYSO lists the size 4 at 25.0 to 26.5 inches circumference and 12 to 14 ounces for the 10U and 12U divisions, moving up to size 5 at 14U.
Are size 4 soccer balls good for adults?+
For practice, yes — a lot of adults and coaches use a size 4 for close-control work because the smaller target forces cleaner contact. For matches, no: adult and U13+ games use a size 5, and training only on a size 4 leaves the strike feeling different when they switch back.
What size soccer ball does a 12 year old use?+
Size 4. AYSO's standards keep the size 4 through the 12U division, with size 5 starting at 14U. A lot of parents assume a twelve-year-old has moved up — check your league, but size 4 is the default at U12.
Is an expensive soccer ball worth it for a 10 year old?+
Generally not. At ten, what matters is that the ball holds air and stays round, which means a butyl bladder and a decent carcass — and that is available cheaply. Match-ball construction only starts paying off around U12, when a player can strike the ball cleanly enough to notice the flight difference.
How often should you pump up a size 4 soccer ball?+
With a butyl bladder, roughly monthly; with a latex one, before nearly every session. Check the pressure range printed next to the valve and inflate to the middle of it. A properly inflated ball barely dents under firm thumb pressure.
Sources
AYSO — Size of Ball and Field by Age Division — Official ball sizes, circumference and weight ranges, and field dimensions by age division. Used for every ball-size and field-size figure on this site.
adidas — kids' soccer — Verified current availability of the adidas models named here, plus adidas's published material and construction claims.
