Helmets & Gear
MIPS helmets explained
MIPS is a slip layer inside the helmet that lets the shell move a few millimeters against the head during an angled impact, reducing rotational force on the brain. It is a real addition rather than marketing — but it is not a substitute for correct fit, and a well-fitted plain helmet beats a loose MIPS one.
What it is
A standard helmet is designed for a straight-on impact: the foam crushes, and the energy that would have gone into the skull goes into the foam instead. Real crashes are rarely straight-on. A head usually hits at an angle, and part of the energy becomes rotation.
MIPS — Multi-directional Impact Protection System — is a low-friction layer between the head and the liner. MIPS describes it as sliding 10 to 15 mm in any direction on impact, which is the mechanism: a few millimeters of slip absorbs some of the rotational energy that would otherwise reach the brain.
The alternatives
Bell fits Mips Evolve, which integrates the slip plane into the retention system rather than adding a separate liner — less weight, fewer parts. Lazer builds KinetiCore into the EPS foam itself, using controlled-crumple blocks to do the same job without a separate layer.
All three are addressing the same problem. We are not in a position to rank them against each other — we do not run impact tests, and we are not going to pretend otherwise.
Does a kid need it?
Our honest read: it is a worthwhile addition if it does not push you into a worse-fitting or heavier helmet, and it is far less important than the three things below.
1. That the helmet fits. A loose helmet rotates on the head regardless of what is inside it.
2. That your child wears it every ride. Compliance beats specification, every time.
3. That it is certified for their age. Under five, the CPSC extended-coverage requirement matters more than any slip layer.
What it costs
MIPS versions typically carry a price premium over the same helmet without it, and add a small amount of weight. Both are real. Whether that trade is worth it is a family decision, and we are not going to pretend there is a single correct answer.
What we would do
Buy the best-fitting helmet in your size band. If two fit equally well and one has a rotational system, take that one. Do not buy a MIPS helmet that fits worse than a non-MIPS one, and do not spend the helmet budget on MIPS if it means skipping the fitting process that actually determines whether it works.
The picks
Every figure below is the manufacturer's own published spec, linked to the page we read it from, so you can check the one number your decision turns on — here is how we choose.
Quick picks — sorted by head size
| # | Product | Score | Best for | Head | Price |
|---|---|---|---|---|---|
| 1 |  Top pickGiro Scamp MIPS II The XS covers a 45–49 cm head and carries the CPSC certification for age 1 and up with extended rear coverage — the combination most toddler helmets miss. | 9.8/10 | Toddlers and preschoolers | 45–53 cm | |
| 2 |  Bell Sidetrack II MIPS 320 g in youth size with a visor and Mips Evolve — the value pick once a child is past five and riding further than the driveway. | 9.5/10 | School-age riders | 47–57 cm | |
| 3 |  Lazer Nutz KinetiCore 250 g and 12 vents, with rotational protection built into the foam rather than added as a separate liner — the lightest helmet in this registry. | 9.0/10 | Hot-weather riding | 50–56 cm | |
| 4 |  NÜDL Youth MIPS A skate-shape helmet with MIPS inside and a magnetic buckle outside, in graphics kids pick for themselves — which is most of the battle at this age. | 9.5/10 | The helmet they'll actually wear | 52–60 cm |
n/p = the manufacturer does not publish that figure. Every other spec number here comes straight off their spec page. Scores are ours, on the 8.4–9.8 scale explained on our how we choose page.
Top pick — Toddlers and preschoolers
Category-defining · our scale
Giro Scamp MIPS II
The XS covers a 45–49 cm head and carries the CPSC certification for age 1 and up with extended rear coverage — the combination most toddler helmets miss.
| Head size | 45–53 cm |
|---|---|
| Brakes | — |
| Frame | In-mold polycarbonate shell, MIPS liner |
| Brand says | XS is CPSC certified for age 1 and older; S for age 5 and older |
Why we picked it
- XS 45–49 cm, S 49–53 cm — two sizes across the whole toddler-to-kid range
- Extended rear coverage on the XS
- Roc Loc Jr. dial fit with a pinch-guard buckle
Good to knowThe MIPS version costs more than the plain shell, and the dial fit wants a quick re-check at the start of each ride.
How we checked it: Researched from published specs · Giro — Scamp MIPS II
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#2 — School-age riders
Category-defining · our scale
Bell Sidetrack II MIPS
320 g in youth size with a visor and Mips Evolve — the value pick once a child is past five and riding further than the driveway.
| Head size | 47–57 cm |
|---|---|
| Brakes | — |
| Frame | In-mold polycarbonate shell, Mips Evolve |
| Brand says | CPSC certified for age 5 and older |
Why we picked it
- Universal Child 47–54 cm and Universal Youth 50–57 cm
- 320 g in size Y, light for a helmet with rotational protection
- Removable visor for trail riding
Good to knowCertified for age 5 and up on universal sizing, so it is the youth pick here rather than the toddler one.
How we checked it: Researched from published specs · Bell — Sidetrack II MIPS
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#3 — Hot-weather riding
Outstanding · our scale
Lazer Nutz KinetiCore
250 g and 12 vents, with rotational protection built into the foam rather than added as a separate liner — the lightest helmet in this registry.
| Head size | 50–56 cm |
|---|---|
| Brakes | — |
| Frame | EPS with integrated KinetiCore rotational protection |
| Brand says | CPSC certified for age 5 and up |
Why we picked it
- 250 g published weight
- KinetiCore rotational protection integrated into the EPS
- 12 vents, which matters in summer
Good to knowOne 50-56 cm size and an auto-adjust cradle: fast to put on, with less manual control than a dial.
How we checked it: Researched from published specs · Lazer — Nutz KinetiCore
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#4 — The helmet they'll actually wear
Category-defining · our scale
NÜDL Youth MIPS
A skate-shape helmet with MIPS inside and a magnetic buckle outside, in graphics kids pick for themselves — which is most of the battle at this age.
| Head size | 52–60 cm |
|---|---|
| Brakes | — |
| Frame | ABS skate-style shell over EPS, with a MIPS liner |
| Brand says | Two youth sizes: YS 52–55 cm and YM 56–60 cm |
Why we picked it
- MIPS in a bucket/skate shell, which most skate-style helmets skip
- Fidlock magnetic buckle: one-handed, and it cannot pinch a chin
- PAS dial fit system for a precise final adjustment
- 11 vents, which a skate shell usually does not have
Good to knowSizing starts at 52 cm, so this is a youth helmet rather than a toddler one, and a skate shell runs warmer than a vented road shape.
How we checked it: Researched from published specs · NÜDL — Youth MIPS helmet
#ad · How we make money · Price as of November 12, 2026
Questions parents actually ask
01What is MIPS and does my kid need it?
MIPS is a low-friction layer that lets the helmet shell slide a few millimeters against the head in an angled impact, reducing rotational force. It is a genuine addition, but correct fit and consistent use matter more.
02Is a MIPS helmet worth the extra money?
If it does not compromise fit or push the helmet out of budget, yes. A well-fitted non-MIPS helmet beats a poorly fitted MIPS one.
03What is the difference between MIPS and KinetiCore?
MIPS adds a separate slip layer inside the helmet. Lazer's KinetiCore builds controlled-crumple blocks into the EPS foam itself. Both target rotational impact forces.
Our recommendation
Top pick
9.8/10Giro Scamp MIPS II
Toddlers and preschoolers. The MIPS version costs more than the plain shell, and the dial fit wants a quick re-check at the start of each ride.
#ad · How we make money · Price as of November 12, 2026
Runner-up
9.5/10Bell Sidetrack II MIPS
School-age riders. Certified for age 5 and up on universal sizing, so it is the youth pick here rather than the toddler one.
#ad · How we make money · Price as of November 12, 2026
Sources
Read next
- Helmets & GearBest kids bike helmetsFive helmets, compared on head size and certification.
- Helmets & GearKids helmet size chartHead circumference to helmet size, in one table.
- Helmets & GearHow to fit a kids bike helmetFour steps, two minutes, and the shake test that proves it.
- Helmets & GearWhen to replace a kids bike helmetAfter an impact, after a growth spurt, after damage.
- Helmets & GearBest kids bike helmets with MIPSThe four helmets here with a real MIPS liner, sized by head.