Dennis Kirk Inc.
Search Within
Ride Search
Top 3 Product Matches

509 Stealth Bomber Altitude Helmet - 509-HEL-ASB-SM

  • Part #:
  • Manufacturer Part #:
This item is no longer available
Overview of 509 Stealth Bomber Altitude Helmet - 509-HEL-ASB-SM


The Altitude helmet is constructed from an innovative new thermoplastic poly alloy outer shell material. This all new material allows for one of the lightest helmets in its class, with a starting weight of just 1260 grams. The Altitude helmet comes in 9 total sizes (Youth SM-LG, Adult XS-2XL) from 3 individual outer shell molds. This results in a smaller overall shell profile, a dialed in fit, and the lightest weight possible.

Perfect Fit

Goggle performance is directly affected by the fit of the goggles in your helmet. Mixing a different brand goggle and helmet will only result in decreased goggle performance. The 509 goggle and Altitude helmet combo was designed to fit and function perfectly together. Both products were specifically engineered for optimal performance from an industry leading combo fit. The Altitude helmet was engineered from the ground up to provide an improved goggle fit over our previous Evolution shell. Experience the first and only true helmet & goggle combo in the snowmobile industry.


Safety is our #1 focus and concern at 509. With the development of the Altitude helmet we put an emphasis on safety & quality. First is the dual density internal EPS foam. This provides two innovative levels of crash absorbing protection. Next is our industry leading thermoplastic poly alloy outer shell that provides a high level of puncture prevention. The Altitude helmet is covered by not one, but two world leading safety standards: DOT & ECE 2205 Certification. Our competitors only offer one level of safety certification.


The Altitude gives you the ability to dial in the level of ventilation you need. Every rider is different and rides in a wide variety of climates. We understand the need for ventilation customization and designed the Altitude for exactly that. Starting with the all new sleek cold weather breath box that you can add or remove in seconds to dial in air flow through the front of the helmet. Next is the lower removable mesh chin curtain. This prevents wind and snow from entering from underneath the chin area. Allow the forehead brow area are 4 removable internal VentStoppers. These innovative inserts can be added and removed to dial in the amount of air that enters the brow of the helmet. In total the Altitude has 8 oversized intake & exhaust vent ports.

All New Breathbox

The Altitude breathbox was redesigned from the ground up. It features a slim & sleek profile that allows the breath box to be worn underneath or on top of your 509 goggles. The breathbox installs/removes in seconds and can be custom formed to fit your specific face profile.

Chin Curtain

This Altitude exclusive feature was born from the request of our customers. Installing in the lower chin area of the helmet (in seconds), this mesh chin curtain prevents unwanted snow and wind from entering from underneath your helmet.

  • Revolutionary neck brace ready shell profile
  • 4 outer shell sizes
  • Specially designed thermoplastic poly allow outer shell
  • Dual density, interlocking EPS
  • Custom fit EPS, specially designed for North America (intermediate oval head profile)
  • Removable, washable premium liner
  • DOT and ECE 2205 Certified
  • Special designed expanded polyurethane chin insert
  • Class leading eye port opening dimensions, which provide optimum peripheral vision
  • Perfect 509 goggle fit
  • One piece eye port trim
  • 8 total oversize intake/exhaust vents
  • Breath box included
  • Universal camera mount included

Medium size weight is 3Lbs., 1 Oz

Double D Ring with anti flutter loop chin strap

Included Items:

(1) Helmet

(1) Helmet bag

(1) Helmet mount 

(1) 6mm-1.00 x 15mm combination hex screw


Specs for 509 Stealth Bomber Altitude Helmet - 509-HEL-ASB-SM

Age Adult
Color Stealth
Color - Primary Black
Helmet Style MX Style
Safety Rating DOT
Safety Rating ECE-22.05
Size Small
Units Each
Weight 5.40 lbs
Specs for 509 Stealth Bomber Altitude Helmet - 509-HEL-ASB-SM
Age Adult
Color Stealth
Color - Primary Black
Helmet Style MX Style
Safety Rating DOT
Safety Rating ECE-22.05
Size Small
Units Each
Weight 5.40 lbs
509 Sizing Information
How to size
HAT SIZE 6 5/8-6 3/4 6 7/8-7 7 1/8-7 1/4 7 3/8-7 1/2 7 5/8-7 3/4 8 8 3/4 9
INCHES 20 7/8-21 1/8 21 5/8-21 7/8 22 1/2-22 5/8 23 1/4-23 1/2 24-24 1/4 24 3/4-25 25 1/4-25 3/8 26-26 1/4
CM 53-54 55-56 57-58 59-60 61-62 63-64 64-65 66-67
Fitment for 509 Stealth Bomber Altitude Helmet - 509-HEL-ASB-SM

Part 3308608S fits the following machines

Make Sure This Fits Your Ride
There are no reviews for this item. Write Review
Start typing your question and we'll check if it was already asked and answered. Learn More
No questions have been asked about this item. Be the first!
Instructions and Manuals for 509 Stealth Bomber Altitude Helmet - 509-HEL-ASB-SM
Owner's Manual Owner's Manual PDF 11.4 MiB