Best Kids' Medium Size Helmets of 2025

Luke Dobson Avatar
Luke Dobson
Last Updated: 6 Feb 2025

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Protecting your child's head while they ride their bike or scooter is of utmost importance. That's why we recommend Kids' Medium Size Helmets, designed specifically for children's heads. These helmets come in a variety of fun colours and designs that your child will love, but more importantly, they are built to provide optimal protection in case of an accident. With adjustable straps and cushioned interior, these helmets are both comfortable and secure. We highly advise investing in a quality helmet to ensure your child's safety while they enjoy their outdoor adventures.

At a Glance: Our Top Picks

Hornit Kids Shark Bike Helmet Cover #TOP 1
Hornit Kids Shark Bike Helmet
ftb score rating icon 9.9
LOKJIJI Adjustable Kids Protective Helmet Cover #TOP 2
LOKJIJI Adjustable Kids Protective Helmet
ftb score rating icon 9.8
MGY Boys Adjustable Galaxy Series Helmet Cover #TOP 3
MGY Boys Adjustable Galaxy Series Helmet
ftb score rating icon 9.6

Top 10 Kids' Medium Size Helmets

#TOP 1

Hornit Kids Shark Bike Helmet

SHM915
Shark
Medium (54-58cm)
Hornit Kids Shark Bike Helmet Cover
Hornit Kids Bike Helmet | Kids Helmet | Child Bike Helmet | Bike, Skateboard, Skating & Scooter Helmet | BMX Helmet Kids | Toddler Bike Helmet | Multi-sport Helmet | (Medium, Shark)

The Hornit Kids Helmet is designed for safety and comfort. It fits children with head sizes between 54-58cm, ensuring a snug fit that can be adjusted as they grow. This helmet is safety tested to CE standards, giving you peace of mind while your child enjoys biking, skateboarding, or scootering. The impact protection features include an inner EPS foam liner and a durable ABS outer shell, providing excellent defence against impacts. Additionally, the 11 air vent cooling system helps keep your little one's head cool during use.

What We Like
Adjustable fit for comfort
Safety tested to high standards
Excellent impact protection
Cooling air vent system
Multi-sport use
#TOP 2

LOKJIJI Adjustable Kids Protective Helmet

LOKJIJI
Black
LOKJIJI Adjustable Kids Protective Helmet Cover
LOKJIJI Adjustable Kids Bike Helmet for Boys Girls Kids Youth Adult, Kids Protective Helmets for Multi-Sports Skateboard Scooter Bicycle Cycling Skating Rollerblading (Black, Medium)

The LOKJIJI Kids Helmet is designed for children aged 5-14, featuring adjustable straps for a perfect fit as they grow. Its strong construction, with an impact-resistant ABS shell and EPS foam, offers excellent shock absorption for safety during activities. The helmet is breathable and comfortable, thanks to 11 vents that keep you cool, while the adjustment dial and padded chin strap ensure a snug, secure fit. This versatile helmet is ideal for various sports, including cycling and skating, providing reliable protection whenever your child needs it.

What We Like
Custom adjustable fit
Strong protective construction
Breathable for comfort
Versatile for multiple sports
#TOP 3

MGY Boys Adjustable Galaxy Series Helmet

MGYZM
Galaxy
MGY Boys Adjustable Galaxy Series Helmet Cover
MGY Boys Helmet, Adjustable Helmet for Kids, Bike Helmet for Girls, Galaxy Series Helmet Highly-Protective & Premium Ventilation, Suit For Multi-Sports Indoor Outdoor (Medium)

The MGY Galaxy Helmet is designed for children aged 5-14, featuring adjustable straps for a secure fit as they grow. With CE and CA safety certifications, it provides essential protection for various sports, ensuring your child's safety during activities like cycling and skateboarding. The helmet's breathable design, with 11 ventilation holes, keeps your child's head cool and comfortable during exercise. Additionally, the adjustable dial system allows you to customise the fit for maximum comfort and security.

What We Like
Adjustable size for growing kids
Certified safety standards
Breathable with ventilation holes
Comfortable adjustable fit
#TOP 4

Ylaide Kids Adjustable Bike Helmet for Ages 3-14

Ylaide
Pink-Blue-Green
Ylaide Kids Adjustable Bike Helmet for Ages 3-14 Cover
Kids Bike Helmet, Adjustable Bicycle Helmet for Girls Boys Ages 3-5-8-14 Years Old, Multi-Sports Protectionfor Cycling Skateboard Scooter Skating. (Medium Size(54-58cm/21.3-22.8 Inches))

The Ylaide Kids Bike Helmet is designed for children aged 3 to 14, offering two adjustable sizes for a perfect fit. Its double layer protection features a high-quality ABS shell and shock-absorbing EPS foam, ensuring safety during outdoor activities like cycling and skating. With an adjustable design, you can easily customise the helmet to your child's head size, providing comfort and security. This helmet is versatile, suitable for various sports such as skateboarding and scooting, making it an essential accessory for your child's active lifestyle.

What We Like
Adjustable sizes for perfect fit
Double layer for enhanced safety
Versatile for multiple sports
Comfortable for active children
#TOP 5

Adjustable Kids Bicycle and Skateboard Helmet

Starry Pink
Adjustable Kids Bicycle and Skateboard Helmet Cover
Kids Girls Toddler Bike Helmet, Adjustable Skateboard Helmet for Little Kids Youth, Protective Helmets for Bicycle Scooter Inline Roller Skating Rollerblading Cycling (Starry Pink, Medium)

The SZHZS Kids Helmet offers excellent protection for your little ones while they enjoy various outdoor activities. It features an adjustable design, ensuring a snug fit for head sizes between 51cm and 58cm. With 11 air vents, this helmet keeps your child's head cool during play. The padded chin strap and quick-snap closure add to the comfort, making it easy for you to put on and take off. Constructed with a strong ABS shell and shock-absorbing EPS foam, it provides reliable safety across multiple sports.

What We Like
Adjustable for perfect fit
Breathable with 11 air vents
Strong ABS and EPS construction
Comfortable padded chin strap
#TOP 6

MET Superbuddy Children's Cycling Helmet Medium

MET
3HELM19M0BB
52-57 cm
MET Superbuddy Children's Cycling Helmet Medium Cover
MET - Superbuddy Children's Cycling Helmet In White / Blue Size Medium (52-57cm)

The MET Superbuddy Helmet is designed for young cyclists, featuring a twin-shell construction that enhances durability and protection. The Safe-T Twist 2 Fit System allows you to easily adjust the fit, ensuring comfort as your child rides. Hand washable comfort pads make maintenance simple, helping to keep the helmet fresh and clean. Additionally, the in-moulded anti-insect net provides a barrier against unwelcome bugs, allowing for a more pleasant cycling experience.

What We Like
Durable twin-shell construction
Easy fit adjustment
Washable comfort pads
Anti-insect net included
Reflective stickers for safety
#TOP 7

Micro Deluxe Children's Helmet with Light

Micro
MAH18MTBLU-S
Navy Blue
Small (48-54cm)
Micro Deluxe Children's Helmet with Light Cover
Micro Scooters | Bike/Scooter Deluxe Children's Helmet | Cycling Accessories | Adjustable Headwear | Boys & Girls | 48-54cm | Matt Navy

The Micro Children's Helmet is designed with safety as a priority. It features an integrated rear light that enhances visibility when your child is out and about, ensuring they are seen by others. The adjustable straps and spin dial allow you to achieve a snug and comfortable fit, providing peace of mind while riding. Additionally, the protective chin pad offers maximum comfort and prevents accidental pinching, making it easier for little fingers to fasten their helmet independently.

What We Like
Enhanced safety features
Integrated visibility light
Comfortable fit adjustments
Prevents pinching
Child-friendly design
#TOP 8

Children's Adjustable Bike Helmet for Ages 3-13

ckorison
CKKID40
Blue
Medium: 50-57cm
Children's Adjustable Bike Helmet for Ages 3-13 Cover
Kids Helmet, Children Bike Helmet for 3-13 Years Old Boys Girls Toddler Helmet Adjustable Kids Helmet for Cycling Scooter Skating

The ckorison Kids Helmet is designed to keep your child safe and comfortable while cycling or engaging in other sports activities. It boasts a sturdy PC outer shell and lightweight EPS foam, providing excellent protection. The helmet features 15 ventilation holes for optimal airflow, ensuring your child stays cool. Additionally, it has an adjustable buckle and spin dial for a customised fit, so you can easily find the right size for your child’s head. This combination of safety and comfort makes it ideal for young adventurers.

What We Like
Safe and reliable design
Comfortable ventilation system
Adjustable for better fit
Multi-sport use
Lightweight and durable materials
#TOP 9

LOKJIJI Adjustable Kids Bike Helmet for Multi-Sports

LOKJIJI
Gradient-Pink Blue
LOKJIJI Adjustable Kids Bike Helmet for Multi-Sports Cover
LOKJIJI Adjustable Kids Bike Helmet for Girls Boys Toddler, Color Gradient Kids Protective Helmets for Multi-Sports Bicycle Cycling Skateboard Scooter Skating Rollerblading Pink Blue (Medium)

The LOKJIJI Kids Bike Helmet is designed for children aged 5 to 14, featuring adjustable straps to ensure a perfect fit as they grow. The eye-catching colour gradient design not only looks stylish but also enhances visibility for added safety. Made from a robust ABS shell and high-quality EPS foam, it offers excellent shock absorption, ensuring your child's head is well-protected during various sports. The helmet’s lightweight construction and 11 vents keep your child cool and comfortable, making it ideal for cycling, skateboarding, and more.

What We Like
Customisable fit for growing kids
Stylish and visible design
Durable and protective materials
Lightweight and comfortable
Suitable for multiple sports
#TOP 10

Micro Bike/Scooter Deluxe Children's Helmet

Micro
MAH26SPC-M
Space Print
Medium (55-58cm)
Micro Bike/Scooter Deluxe Children's Helmet Cover
Micro Scooters | Bike/Scooter Printed Deluxe Children's Helmet | Cycling Accessories | Adjustable Headwear | Boys & Girls | 55-58cm | Space Print

The Micro Children's Helmet prioritises safety, ensuring your child wears a properly fitted helmet while riding. The integrated rear light enhances visibility, providing peace of mind during outdoor activities. With adjustable straps and a spin dial, you can achieve a snug, comfortable fit for your child's head. Additionally, the protective chin pad offers maximum comfort and prevents accidental pinching, making it easier for little fingers to fasten the helmet independently.

What We Like
Enhanced safety for children
Integrated rear light for visibility
Adjustable for a secure fit
Comfortable chin pad design
Easy for kids to fasten
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What size is a small medium helmet?

One brand will have a Medium size being the equivalent to 54 – 58 cm, while another brand will show Medium size as being 55 – 60 cm....7iDP Mountain Bike Helmets Sizing #3.

Editor's Notes

During our kids' medium size helmet research, we found 124 kids' medium size helmet products and shortlisted 10 quality products. We collected and analyzed 5,569 customer reviews through our big data system to write the kids' medium size helmets list. We found that most customers choose kids' medium size helmets with an average price of £20.91.

The kids' medium size helmets are available for purchase. We have researched hundreds of brands and picked the top brands of kids' medium size helmets, including Hornit, LOKJIJI, MGYZM, Ylaide, SZHZS. The seller of top 1 product has received honest feedback from 60 consumers with an average rating of 4.8.

Written by
Luke Dobson Avatar

Luke is a runner, a climber, hiker, hunter, and a lot more. Luke Dobson is Celtic-born and has lived most of his life in Scotland. However, his sporting endeavours have taken him to several countries around Europe. He serves as a tour guide for countless companies and owns a couple of gyms and recreational centres in Scotland. Luke Dobson is proficient in 7 different languages. He maintains many sport article columns where he shares his wealth of experience in the sport industry.