Helmets & Gear
Best kids bike helmets
Every helmet sold for cycling in the US must meet the same federal standard, so you are not choosing between safe and unsafe — you are choosing the one that fits. Measure the head, match the centimeter range, and check that the certification covers your child's age.
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Every bicycle helmet manufactured or imported for sale in the US must meet the CPSC standard at 16 CFR 1203 — a federal requirement since February 1999. So the safety floor is the same everywhere. What varies is fit, weight, ventilation and whether the certification covers a child under five.
| Helmet | Sizes (head cm) | Rotational system | CPSC age | Weight |
|---|---|---|---|---|
| Giro Tremor MIPS | 47–54 (Universal Child) | MIPS | Child fit | not published |
| Giro Scamp MIPS II | XS 45–49 · S 49–53 | MIPS | XS: 1+ · S: 5+ | not published |
| NÜDL Youth MIPS | YS 52–55 · YM 56–60 | MIPS | 16 CFR 1203 | not published |
| Bell Sidetrack II MIPS | Child 47–54 · Youth 50–57 | Mips Evolve | 5 and older | 320 g (size Y) |
| Lazer Nutz KinetiCore | 50–56 (one size) | KinetiCore | 5 and up | 250 g |
Read from each manufacturer's published information on 2026-09-23, re-checked against the live listings on 2026-10-03. Where a brand does not publish a weight, we leave it blank rather than estimating.
Measure the head, not the age
Wrap a soft tape around the head about an inch above the eyebrows, at the widest point. That number in centimeters is what helmet sizes are built around. The size chart maps the bands.
The same principle runs through the rest of the protective gear, and it is the fastest way to tell a serious product from a toy: the pads worth buying publish a leg measurement, not an age. We apply that test to five of them on best kids knee pads.
The certification detail most people miss
CPSC requires that helmets intended for children up to age five cover more of the head than an adult helmet does — extra protection for the more fragile areas of a young child's skull. That is why Giro certifies the Scamp XS for age 1 and older with extended coverage, while the larger S size is certified for age 5 and older.
Practically: if your child is under five, look for a helmet whose stated certification covers that age. A small adult helmet is not the same product.
Weight, where it is published
250 g
Lazer Nutz KinetiCore
320 g
Bell Sidetrack II MIPS, size Y
n/p
Most brands publish nothing
A lighter helmet is one a child argues about less. It is not a safety figure — every one of these meets the same standard — but it is a wearing-compliance figure, and a helmet in the garage protects nobody.
Rotational protection: MIPS and the alternatives
MIPS is a low-friction layer inside the helmet that lets the shell move slightly against the head during an angled impact. Lazer's KinetiCore builds the same idea into the foam itself. Both add cost. The full explanation, and an honest read on how much it matters for a six-year-old on a sidewalk, is on MIPS helmets explained.
Which one
Toddlers (45–50 cm): Giro Scamp XS, which is certified for age 1 and up, or the Giro Tremor MIPS from 47 cm.
Preschool to school age (48–54 cm): Giro Scamp S, the Giro Tremor MIPS, or the Bell Sidetrack II in Child.
Older kids (50–57 cm): Bell Sidetrack II Youth or Lazer Nutz. The Lazer is the lightest here at 250 g.
The one they will actually wear: whichever one your child picks the graphics on. This is not a joke — compliance is the binding constraint on helmet effectiveness.
If you are buying pads at the same time, the helmet-and-pad pairings that actually fit one child are on best kids bike helmet and pad sets.
A helmet is the first thing to buy and a light is usually the second, because the ride home in winter starts in the dark. Our picks, chosen on the mount and the switch rather than the brightness, are on best kids bike lights.
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 |  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 | |
| 4 |  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 | |
| 5 |  Giro Tremor MIPS One Universal Child shell covering 47–54 cm with integrated MIPS and a hard outer shell — the first helmet that still fits two birthdays later. | 9.4/10 | A first helmet | 47–54 cm | $64.00 · Giro Tremor MIPS on Amazon
|
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
#ad · How we make money · Price as of November 12, 2026
#3 — 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
#4 — 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
#ad · How we make money · Price as of November 12, 2026
#5 — A first helmet
Outstanding · our scale
Giro Tremor MIPS
One Universal Child shell covering 47–54 cm with integrated MIPS and a hard outer shell — the first helmet that still fits two birthdays later.
| Head size | 47–54 cm |
|---|---|
| Brakes | — |
| Frame | Hard outer shell over an in-mold polycarbonate lower wrap, integrated MIPS |
| Brand says | Sold in one Universal Child fit, 47–54 cm |
Why we picked it
- 47–54 cm in a single shell, so there is no size to get wrong
- Integrated MIPS at a genuinely child-sized shell
- Roc Loc Sport dial with a 7 cm adjustment range, one-handed
- Two-piece shell: a tough outer hard shell over an in-mold polycarbonate lower wrap
Good to knowOne size only, 50-57 cm, so measure the head before you buy; Giro publishes no weight for it.
How we checked it: Researched from published specs · Amazon listing — Giro Tremor MIPS Child
$74.95 · 15% off
#ad · How we make money · Price as of November 12, 2026
Questions parents actually ask
01What is the best kids bike helmet?
The one that fits the measured head circumference and carries a CPSC certification covering your child's age. For toddlers, the Giro Scamp XS (45–49 cm, certified age 1+); for older kids, the Bell Sidetrack II or Lazer Nutz.
02Are expensive bike helmets safer?
Not in the sense people expect: every bicycle helmet sold in the US must meet the same CPSC standard. More money buys lighter weight, better ventilation, dial-fit systems and rotational protection like MIPS.
03Does my child need a MIPS helmet?
MIPS addresses rotational forces in angled impacts. It is a genuine addition, not marketing, but it is not a substitute for correct fit — a well-fitted non-MIPS helmet beats a loose MIPS one.
04How do I know a helmet is legal in the US?
Look for the CPSC label inside. Since February 1999 every bicycle helmet manufactured or imported for sale in the US has been required to meet the federal standard and to carry that label.
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 & 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 & GearBest toddler bike helmetsHelmets certified for age 1+, with the extra coverage required.
- Helmets & GearMIPS helmets explainedWhat the slip layer does, and when it is worth paying for.
- Helmets & GearBest kids bike helmets with MIPSThe four helmets here with a real MIPS liner, sized by head.
- Helmets & GearBest kids knee padsFive real kids knee pads, sized by leg measurement rather than age.
- Helmets & GearBest kids bike lightsFive real light sets, chosen on the mount and the switch rather than the lumens.