OutdoorMaster Gem II MIPS Bike Helmet with Light

The OutdoorMaster Gem II MIPS bike helmet pairs a rechargeable rear light with adjustable sizing and a 21-vent design. Its listed size here is Small, so use the head-circumference guidance carefully before ordering.

At a glance

MIPS system is described as designed to reduce harmful rotational forces in certain impacts.
Plug-in USB-rechargeable rear light offers steady and two flashing modes.
21 vents with internal air channels and removable, washable padding.
The fit can be adjusted by hand, with three size ranges listed.

Price

$50.99Save 15%

Reference price: ~~$59.99~~

Price checked: Nov 14, 2026

View offer

Pros and cons

Pros

The integrated rear light avoids a separate light purchase and offers three modes.
Removable washable padding and 21 vents are practical for regular rides.
Three size options cover listed head circumferences from 52 to 62 cm.

Technical specifications

16 specifications

Identity
Brand	OutdoorMaster
Model	Gem II

Fit and materials
Listed size	Small
Size range	S: 20.47-21.65 inch (52-55 cm); size M: 21.65-22.83 inch (55-58 cm); size L: 22.83-24.41 inch (58-62 cm)
Recommended head circumference	Size S: 20.47–21.65 inches (52–55 cm) → Recommended for head circumference 50–53 cm Size M: 21.65–22.83 inches (55–58 cm) → Recommended for head circumference 53–56 cm Size L: 22.83–24.41 inches (58–62 cm) → Recommended for head circumference 56–60 cm
Age range	5 Years and Older
Color	Mint Green
Outer material	Polycarbonate (PC)
Inner material	Expanded Polystyrene

Features and use
Ventilation	21 vents
Special feature	adjustable
Recommended use	Cycling
Rear light	3 Lighting Modes-steady, fast flashing and slow flashing
Light charging time	60 minutes
Claimed light runtime	13 hours
Weight listed	0.37 kg

What to know before buying

Listing details to confirm

Sizing guidance is inconsistent: the general chart assigns S to 52–55 cm, M to 55–58 cm and L to 58–62 cm, while another section recommends smaller head-circumference bands and says the helmet runs small, advising measurement plus 2 cm. The listing also says light charge takes 60 minutes and runtime is 13 hours, but gives no operating conditions for that runtime. Confirm fit against the selected size and listing before buying.

Who is it for?

A good fit for

Cyclists wanting a helmet with a built-in rear light and adjustable fit.
Riders seeking ventilation and removable washable padding for everyday cycling.

Less suited to

Buyers who need a size outside the listed S–L ranges.
Anyone who needs a clearly consistent size recommendation without checking the conflicting guidance.

OutdoorMaster Gem II MIPS Bike Helmet with Light · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 397 ratings

5 stars76%76%
4 stars8%8%
3 stars8%8%
2 stars3%3%
1 star5%5%

Customer feedback describes positive experiences with fit, adjustability, lightweight feel, appearance and the rear light. A reported light visibility observation and praise for MIPS are individual customer impressions, not verified performance findings. These comments are relevant to the listed adjustable fit and integrated three-mode light, but they do not resolve the contradictory size guidance or establish safety performance.

Positive themes

Customers report favorable fit and appreciate the adjustable frame.
Feedback praises the rear light, lightweight feel, appearance and functionality.

Frequently asked questions

What sizes are listed for the Gem II?

The listing gives S as 52–55 cm, M as 55–58 cm and L as 58–62 cm, but also provides a conflicting recommended-head-circumference chart. Measure carefully and confirm the selected listing's sizing.

What lighting modes does the rear light offer?

The claimed modes are steady, fast flashing and slow flashing. The listing states 60 minutes to charge and a 13-hour runtime, without specifying conditions for that runtime.

Does this helmet have removable padding?

Yes. The listing says the padding is removable and washable.

What is the listed weight?

The product details list a weight of 0.37 kg.