Giro  Source Mips Bike Helmet

$149.95
Members get an est. $14.99 in rewards

Combining advanced performance and protection in a rugged, trail-ready design, the Giro Source Mips bike helmet is made to keep you cool and comfortable, even when the riding gets rowdy.

Color: Matte Chalk
please select a Size
Quantity
Select size for delivery dates
Shipping restrictions apply.

Members get an estimated $14.99 (10%) back on this item as a part of your annual .

Members get an estimated $14.99 (10%) back on this item.
To buy,  sign in as an REI Co-op Member or join now.
10% co-op member reward: $14$14 Member Reward
$30Member Bonus Card

This purchase pays for membership!

$14

10% Reward

on this and every eligible full-price item*

+

$30

Bonus Card

valid for 60 days after joining*

=

$44

Value

Start earning when you buy a $30 lifetime membership.

Keep shopping

Features

  • Integrated Mips® brain protection system: All Giro helmets are designed to reduce as much energy as possible while meeting and exceeding stringent safety standards
  • Goal of Giro integrated Mips-equipped helmets is to reduce rotational forces, while enhancing fit and comfort by combining the Mips slip plane with the adjustable fit system
  • Giro believes that helmets equipped with this technology can reduce the amount of rotational force that may be transferred to rider's brain in certain impacts
  • Deep coverage with aggressive ventilation from 17 vents coupled with deep internal channeling helps keep things cool
  • Wind Tunnel ventilation system combines active vents in the shell with inner exhaust channels that thrust fresh, cool air over and around your head while forcing heat out
  • This effective cooling system provides a difference you can feel every time you ride
  • Roc Loc® 5 fit system allows you to easily custom-tune the fit tension and fore-aft tilt of the helmet in seconds, using a single hand, for a comfortable, stable fit
  • In-mold lower Hardbodyâ„¢ wrap fuses a light-yet-tough polycarbonate shell to the foam liner, eliminating adhesives and excess weight
  • Hardbody design extends coverage to the inside of the helmet to enhance durability
  • Tool-free, bolt-on visor is easily adjustable and offers plenty of vertical adjustment, giving you a spot to stage your goggles when you're not wearing them
  • Adjustable moto-style screw-in visor features an adjustment mechanism that lets you move the visor up and down in indexed steps and can be easily adjusted with one hand
  • These steps include 3 riding positions plus a high position for goggles storage above your brow
  • Certification: CPSC

Imported.

To find your size, position a tape measure just above your ears and about 1 in. above your eyebrows. Keep the tape level to measure the circumference around the largest part of your head and then find the corresponding size in the Technical specs info.
View all Giro Mountain Bike Helmets

Technical Specs

Best Use

Mountain Biking

Helmet Style

Mountain Bike

Helmet Construction

In-mold

Shell Material

Polycarbonate

Head Circumference

S: 20-21.5 inches

M: 21.5-23.25 inches

L: 23.25-24.75 inches

Vents

17

Visor/Brim

Yes

Weight

S: 11.2 ounces

M: 12.3 ounces

L: 14.1 ounces

Gender

Unisex

Reviews
8 reviews with an average rating of 4.8 out of 5 stars

Ratings Snapshot

Product Rating

8 out of 8 (100%) reviewers recommend this product

Review this Product

Adding a review will require a valid email for verification

Average Customer Ratings

Overall Fit Rating

Runs SmallRuns Large

Customer Images

Sedoung
Received free product
San Diego, CA
Rated 4.0 out of 5 stars

lightweight and comfortable for long rides

5 months ago

This giro source is an upgrade from my previous helmet. I like that it is light weight but also has good padding that’s is attached via helmet sizer. Padding is more than front and back, but the whole thing. See pics. I love the movable visor, as well as the sizer. I’m 5’6 and the large fits great. I think if I went with the smaller size it would have been too small. Fits great and not too heavy or hot. Wore it on my first ride and i love the movable visor thing.

Age:45–54
Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large
Helpful?
Sonofjohn
Received free product
Richland, WA
Rated 5.0 out of 5 stars

Great Helmet with Adjustable Visor!

5 months ago

Great all-around helmet, especially at the price. Offers all the safety features, great retention system, and adjustable visor. Wore it on a couple gravel and MTB rides and had no complaints! Was comfortable, easy to dial the fit in, and offered good ventilation. The visor doesn't have much movement, but that seems to be the norm. Felt comfortable with the padding across my scalp and there no issues with the straps.

Age:45–54
Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large
Helpful?
Hootie hoo
Received free product
Virginia
Rated 5.0 out of 5 stars

Classic look, simple bike helmet

5 months ago

Nice fitting, classic look bike helmet. Easy to adjust the size. I like the matte white look over glossy finishes. Not bulky looking, but some interior padding. No fancy bells and whistles, lights or design. Don’t overthink it, it’s just a bike helmet that’s comfortable and does what it’s supposed to.

Age:35–44
Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large
Helpful?
Tater
Received free product
Chicago
Rated 5.0 out of 5 stars

I am impressed with this helmet.

5 months ago

This helmet is designed as a trail ready helmet but I use it more as an all arounder. I use it for road, gravel, and cross country mountain biking. The helmet provides good coverage for the base of the skull and includes Mips technology which is a must for me. The helmet is surprisingly lightweight and has impressive ventilation. The adjustable and removable visor is well built and designed. The helmet has the perfect amount of padding so it is comfortable to wear but not too hot. There are intuitive and easy adjustments to make sure the helmet fits your head perfectly. I can't think of anything I would change, they really did a great job designing this.

Age:35–44
Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large
Helpful?
Swerve
Received free product
Salt Lake
Rated 4.0 out of 5 stars

Just a simple, safe feeling helmet.

5 months ago

Alright folks, this right here is a pretty solid helmet. Let’s go over the good and the meh: The good: I really like how it fits. The padding is comfortable, it does have a mips rating, and the dial in the back allows you to really dial it in and get a snug fit that makes it feel like it’s not going anywhere should you take a spill. I also like the classic clip on the strap; my other helmet has a magnetic fidlock and I worry it could pop off if I had a nasty crash. While it’s never happened, it’s certainly in the realm of possibility. The meh: it’s still pretty cold here with snow, so I couldn’t get on trails and really break a sweat. So to test it out, I poured a little water on the padding to see how it’d go. The front pad is nice and absorbs the water (sweat), which is good. The issue is the lack of vents right up front for ~the first inch on your forehead. Without the vents there, it’s not as great at having airflow come through and evaporate/wick the moisture out of the padding. On real hot days, I could see myself getting bugged by this, maybe developing hotspots on my forehead, and having sweat drip down to my eyes more than I’d like. For colder climates or fall/winter riding, it’s a solid choice that I’d grab. The other thing I wasn’t super keen on is the visor; typically it’s easy to take them off and throw them up under the visor when I don’t need them on. This helmet doesn’t really allow for that as you can see in the picture. I ride with a cheap pair of safety glasses, so it might be different if you’re someone that buys fancy shmancy bike glasses. Overall, it’s a solid feeling helmet that gets the job done. I enjoy the fit and the comfort of the padding in there, but the airflow/ventilation felt lacking. The fit and form just made me feel really safe when it was on. So as a helmet, I give it a solid 3.5/5. I wish it had a couple other bells and whistles for my personal preference, but those are definitely subjective.

Age:25–34
Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large
Helpful?
kcakezzz
Knoxville, TN
Rated 5.0 out of 5 stars

cute and comfy helmet

7 months ago

I have a ton of helmets for different applications (climbing, road cycling, whitewater) and this mountain bike helmet is the most comfortable one I own. It’s easily adjustable and has the most perfect built in visor.

Age:25–34
Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large
Helpful?
Laura S
California
Rated 5.0 out of 5 stars

Fits great!

7 months ago

Fits like a glove. Very comfortable and great value.

Age:65–74
Yes , I recommend this product

Overall Fit Rating

Runs SmallRuns Large
Helpful?
KHS
Rated 5.0 out of 5 stars
1 month ago
Age:65–74
Yes , I recommend this product
Helpful?

Questions & Answers

Loading Questions...