Injection molded shell and EPS foam construction for ultimate protection
Reliable DOT and ECE 22.06 certified safety and protection
Moisture wicking cheek pads and liners for optimal comfort
Channel venting in the EPS foam and adjustable venting ports allows controlled air flow
The Double D-ring closure system guarantees a snug and secure fit for your safety
You're going to LOVE the fit. Try it on and experience our perfect fit. If you don't love it, send it back in new and unused condition within 30 days for an exchange or full refund*. Risk free.
Not sure about your size? Try on at your local dealer!
*Street Helmets are a tighter fit due to cheekpad compression, however, they do pack out over time/use.
How to Measure
When measuring your head, use a cloth tape. Start it just above your eyebrows and circle it around the thickest point in the rear of your head and then reference the size guide below.
Scroll to the right to see more sizes
| Size | US Hat Size | Inches | Centimeters |
| X-Small | 6 5/8 - 6 3/4 | 20 7/8 - 21 1/8 | 53 - 54 |
| Small | 6 7/8 - 7 | 21 5/8 - 21 7/8 | 55 - 56 |
| Medium | 7 1/8 - 7 1/4 | 22 1/2 - 22 5/8 | 57 - 58 |
| Large | 7 3/8 - 7 1/2 | 23 1/4 - 23 1/2 | 59 - 60 |
| X-Large | 7 5/8 - 7 3/4 | 24 - 24 1/4 | 61 - 62 |
| 2X-Large | 8 | 24 3/4 - 25 | 63 - 64 |
| 3X-Large | 8 3/4 | 25 1/4 - 25 3/4 | 64 - 65 |
| 4X-Large | 9 | 26 - 26 1/4 | 66 - 67 |
| Youth Small | 6 | 18 1/8 - 18 7/8 | 47 - 48 |
| Youth Medium | 6 1/8 - 6 1/4 | 19 1/4 - 19 5/8 | 49 - 50 |
| Youth Large | 6 3/8 - 6 1/2 | 20 - 20 1/2 | 51 - 52 |
Pressure Points
When trying on a helmet, take note of any pressure points on your forehead—a sign that the helmet is too round. Pressure points on the sides of your head indicate a helmet is too oval for the shape of your head. After you buy a new helmet, try wearing it for 30 to 45 minutes to check for pressure points before using it on a ride.
Pressure Points
When trying on a helmet, take note of any pressure points on your forehead—a sign that the helmet is too round. Pressure points on the sides of your head indicate a helmet is too oval for the shape of your head. After you buy a new helmet, try wearing it for 30 to 45 minutes to check for pressure points before using it on a ride.
Overall rating: 5.0 / 5 from 16 reviews.
Review topics: ["quality","color","helmet","option","light"].
"The blue is a little different in person but so beautiful! My bf and i can not wait to try these this winter!"
"Super lightweight and amazing fit! The color is absolutely beautiful!"
"Bought this as a gift for my brother. He loves it!"
"Great fit and lightweight"
"Awesome helmet…509 is all i wear on the snow"
"I am pleasantly surprised with these Atmosphere helmets vs the next step up, Tactical! Just getting into the sport 6 years ago, I chose 509 as a brand because of the affordability being an entry level rider and quality to competitors. I appreciate having this option for newbies getting into the sport, and even seasoned riders! These are lighter in weight to the tactical too, which is a huge plus! And also different color options"
"Lightweight fit perfectly"
"Awesome"
"Best helmet I ever wore very comfortable while riding"
"Great price and yet seems to be just as well built as my altitude 2. 0. Great option for beginners looking for affordable gear."
