Mizuno RB 566 Golf ball compression, specs & review
The Mizuno RB 566 is a 60-compression, 2-piece golf ball with an ionomer cover, low spin and a mid flight. A soft two-piece ionomer (durable, firm cover) ball featuring an innovative 566 micro-dimple design (tiny dimples that extend hang time) that maximizes carry distance for golfers with slower swing speeds.
Is 60 compression right for your swing? The quiz checks your swing speed and feel against every ball in our catalog, this one included.
Take the quiz →What do these specs mean?
Compression
How soft the ball feels. Lower numbers (70–80) compress easier and help slower swings get distance. Higher (90+) rewards faster swings.
Cover
Surlyn is tough and cheap — great for distance and durability. Urethane is softer and grips wedges for more spin around the green.
Layers
2-piece: simple, long, straight. 3-piece and 4-piece add layers for more feel and spin control on approach shots.
Trajectory
How high the ball flies. Low = flatter flight with more roll. High = peaks up and lands soft. Mid = balanced.
Spin
Low spin = straighter shots, less curve, more roll. High spin = more control and stopping power on the green (but also magnifies slices/hooks).
Tier
Price bucket. Value = budget-friendly distance balls. Mid = solid all-around. Premium = tour-level spin and feel, costs more per dozen.
Best For
Try a sleeve first — ~$5 for 3 balls before committing to a dozen.
What golfers told our quiz
38% of the 2,698 golfers who finished our quiz say they want their drives to go straighter. The Mizuno RB 566 is rated low-spin, and less spin means less curve.
Take the 90-second quiz to see which balls fit your swing.
Self-reported answers from 2,698 finished quizzes, as of Oct 4, 2026.
A soft two-piece ionomer (durable, firm cover) ball featuring an innovative 566 micro-dimple design (tiny dimples that extend hang time) that maximizes carry distance for golfers with slower swing speeds.
Who It’s For
The Mizuno RB 566 is built for slower swing speeds (under ~95 mph). It suits golfers who prioritize slow swing speed, seniors, high handicap, budget friendly. In the Mizuno lineup, the RB 566 sits softer than the Mizuno RB Max.
Feel
At 60 compression the RB 566 is Mizuno’s soft ball, and with an ionomer cover it feels cushioned on full shots and muted on chips and putts.
Spin Profile
Mizuno builds it low-spin for slower swingers, and the 566 micro-dimples are there to hold the ball in the air longer so that low spin does not cost carry. Around the green the ionomer cover gives you a soft-feeling chip that releases; it is not a ball for stopping a pitch on the second bounce.
Trajectory & Construction
We rate the flight mid rather than high, with the 566 micro-dimple pattern doing the work of extending hang time instead of a higher launch. Two pieces, a soft core under an ionomer cover with 566 small dimples cut into it, is a simple build that keeps the price at $22. Performs well in cooler temperatures.
Price & Value
At $22.00 per dozen, the RB 566 is a value pick. The two-piece ionomer build lasts, and $22 keeps it in budget territory.
Buy it if
- You swing slower and want a soft ball from a name-brand maker at a fair price.
- You tee it up in cool weather; a 60-compression ball stays soft when others firm up.
- You want hang time without spin; that is exactly what the 566 micro-dimples are designed to add.
Skip it if
- You are a fast swinger who likes a firm, fast feel; this one will feel spongy to you.
- You want wedge shots that grab; the ionomer cover is built to last, not to spin.
Similar Balls
- Titleist Tour Soft — 88 compression, low-spin, $40
- Titleist Velocity — 90 compression, low-spin, $30
- Titleist TruFeel — 70 compression, low-spin, $25
- Callaway ERC Soft — 60 compression, low-spin, $40
Source: MyGolfSpy compression research and 2026 ball test.
Frequently Asked Questions
What is the compression of the Mizuno RB 566 golf ball?
The Mizuno RB 566 has a compression of about 60, which puts it in the low-compression range. At 60 the RB 566 is a genuinely soft ball, meant for slower swingers and seniors who want a cushioned hit and a low-spin flight. It is one of several specs the BallCaddie fitting quiz weighs against your swing speed, usual miss, feel preference and budget.
Who should play the Mizuno RB 566?
The Mizuno RB 566 is built for slower swing speeds (under ~95 mph). It suits golfers who prioritize slow swing speed, seniors, high handicap, budget friendly.
What swing speed is the Mizuno RB 566 designed for?
Mizuno aims it at slower swing speeds. It was not in MyGolfSpy’s 2026 robot test, so choose it for the soft feel, the low spin and the micro-dimple carry design rather than a measured distance number.
Does the Mizuno RB 566 have high greenside spin?
Greenside spin is moderate. The RB 566’s ionomer cover is soft but slick against the grooves, so chips and pitches roll out more than they would with urethane.
Is the Mizuno RB 566 good in cold weather?
Yes. A 60-compression core has a long way to go before it feels hard, so the RB 566 keeps its soft feel on cold mornings.
How much does the Mizuno RB 566 cost?
MSRP is $22.00 per dozen.
Read more about the Mizuno RB 566
Compare all four Mizuno golf balls by swing speed, spin, and price. Where the Pro S and Pro X tour balls fit, and how they stack up to a Titleist Pro V1.
The big number under the brand is your play number and nothing more. What 1-4, 00, three-digit stamps and the old 90/100 compression numbers actually mean.
The softest golf balls of 2026 ranked by compression — from the ~35 Maxfli SoftFli to the softest urethane tour balls, with measured-vs-marketed data.
The best low-compression golf balls for swing speeds under 95 mph — measured compressions, robot-test distance data, and when soft urethane is worth it.
Compression for all 72 golf balls in our catalog, banded by 70/80/90 and matched to swing speed, plus why low compression isn't always right for slow swings.
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