K4 Intercom Modular Helmet with Bluetooth

A helmet only protects you properly when it fits. Take two minutes to measure before you order.

How to measure your head

Use a soft measuring tape. No tape? Use a piece of string, then measure the string with a ruler.
Wrap it around the widest part of your head, about one inch above your eyebrows and just above your ears.
Keep the tape level all the way round and comfortably snug.
Measure two or three times and use the largest reading.

Match your measurement to the chart

Sizing differs between helmet models, so always use the size chart shown on the product page of the helmet you want. Don't assume your size in one helmet is your size in another.

How a helmet should feel

Snug all the way around, with the cheek pads touching your cheeks.
No pressure points or hot spots on your forehead.
With the strap fastened, the helmet should not roll forward off your head or twist freely side to side.
New helmets loosen slightly as the padding beds in, so a firm fit is normal.

Between two sizes?

Email contact@ridercape.com with your measurement and the helmet you're looking at, and we'll help you choose.

Gloves, jackets and boots

For riding gear, use the size information on each product page and compare it with your own measurements.

If the fit isn't right when it arrives, see our Refund Policy.

Built for your next ride

Description

The K4 is a modular motorcycle helmet with a Bluetooth intercom for 2-8 riders and a 500 m range, fitted from the factory. Its 3-in-1 flip-up design and 30 hour battery make it a strong pick for group touring. Seven finishes are available, including Matte Black, Gloss Black, Titan Silver and White, all with a clear visor, in sizes S to 3XL.

Key features

3-in-1 riding modes: ride full-face, flip-up or in open modular visor mode.
Group intercom: real-time chat for 2-8 riders within a 500-meter range.
190° field of view: an optical-grade PC visor gives a sharp, panoramic view, and it accepts anti-fog inserts for cold or humid weather.
Built-in sun visor: an internal tinted lens handles glare without sunglasses.
Noise cancellation: reduces wind and engine noise so you can keep the volume lower.
Dual-device pairing and voice assistants: connect two devices, such as phone and GPS, with automatic switching, and use Siri or Google Assistant hands-free.
Multi-channel ventilation: chin, top and rear vents keep air moving all day.

Specifications

Shell: ABS with EPS foam liner
Interior: breathable, removable padding with pre-installed speaker pockets
Aerodynamics: wind-tunnel tested to reduce lift, noise and drag
Visor: optical-grade PC, 190° field of view, anti-fog insert compatible
Bluetooth: 5.4 chipset
Intercom: 2-8 riders, 500 m range
Battery life: 30 hours
Standby: 1000 hours
Charging time: 5-7 hours
Call control: automatic or manual answering by one-touch control

Sizing

Sizes S, M, L, XL, 2XL and 3XL. See the size chart below.

Size	Head Circumference (inches)	Head Circumference (cm)
S	21.7 – 22.0 in	55 – 56 cm
M	22.4 – 22.8 in	57 – 58 cm
L	23.2 – 23.6 in	59 – 60 cm
XL	24.0 – 24.4 in	61 – 62 cm
XXL	24.8 – 25.2 in	63 – 64 cm
3XL	25.6 – 26.0 in	65 – 66 cm

Find your fit.

A great ride starts with the right fit. Measure your head before you pick a size.

Wrap a soft measuring tape around your head, just above your eyebrows and ears.

Keep the tape level and comfortably snug, then read your head circumference.

Match your measurement to the size chart for this helmet in the description above.

Between two sizes? A helmet should feel snug without pressure points. Not sure? Email contact@ridercape.com before you order.

Frequently asked questions

How do I choose the right helmet size?

Measure your head circumference just above the eyebrows and ears, then compare it with the size chart in the product description. Sizing can differ between helmet models, so check the chart for this one.

Is this helmet safety certified?

Where a helmet carries a certification such as DOT or ECE, it is listed in the product description. If you can't find it there, email us before ordering and we'll confirm.

How much is shipping?

Shipping is calculated at checkout and shown before you pay, so there are no surprises.

Which options come with my order?

You receive exactly the variant you select above — colour, size and any other option shown. Double-check your selection before adding to cart.

How do I contact support?