Ends Friday—Save 20% on Castelli In-Season Clothing »

Giro Selector Helmet


Item # GIR0398 Past Season Colors

Tell us your actual inseam

Note: Actual inseam is not the same as pant inseam.  How to measure

We recommend a size in this bike.

Your inseam: Edit More details

Our size calculator is a starting point for finding the right size for you. To get personal advice talk to one of our fit experts at 1.888.276.7130 or chat now

Select options
  • Select options
  • Red/Black, M/L ($274.95)
  • Red/Black, S/M ($274.95)
  • White/Silver, M/L ($274.95)
  • White/Silver, S/M ($274.95)
  • Black, S/M ($274.95)
  • Black, M/L ($274.95)
  • 100% Guaranteed Returns
  • Free Shipping on orders over $50

Item # GIR0398

Selective speed.

When Giro looked to up its aero game, it didn’t just paste new stickers onto its Advantage helmet. It looked at the data and redesigned it to create the Giro Selector. This helmet is now a standard in the professional peloton and should be a part of your aero kit as well.

Giro used wind tunnel testing to sculpt a shape that works with your position on the bike to lessen the drag coefficient. On the front end, you’ll notice the eye shield. Not only does this minimize tear-inducing wind in your eyes, it also smooths the leading surface so that the air moves over it faster. An added benefit is that the shield also acts to block out excess wind noise. Two vents help direct the air through the helmet and out the back vents to cool your head. For those who prefer sunglasses, however, the shield is removable. On the other end, the tail of the Selector helmet is closed on the underside and comes in two lengths, 10mm and 45mm. Each is designed to work with your body position and the choice depends on how low your shoulders and arms are. The helmet should sit low and close to your back when you are in an aero position.

To secure the Selector, Giro uses the Roc Loc TT system. Different from the older Roc Loc 5 system, the TT uses a spring leaf system to apply even tension to the front and back of your head in order to secure the helmet. The body of the helmet is an EPS-injected molded liner with the Giro SL Roll Cage system and a polycarbonate shell.

  • Time trial, triathlon
  • Removable front shield
  • 10mm and 45mm rear inserts
  • Roc Loc TT strap system

Tech Specs

Shell Material:
Fit Adjustment:
adjustable chin strap, Roc Loc 5 TT
Recommended Use:
Manufacturer Warranty:
1 year

Size chart


Adult Cycling Helmets
 SS/MMM/LLXLAdult UniversalWomen's Universal
Head Circumference 20 - 21.75in
(51 - 55cm)
20 - 22.5in
(51 - 57cm)
21.75 - 23.25in
(55 - 59cm)
21.75 - 24in
(55 - 61cm)
23.25 - 24.75in
(59 - 63cm)
24 - 25.55in
(61 - 65cm)
21.25 - 24in
(54 - 61cm)
19.75 - 22.5in
(50 - 57cm)
Head Circumference 20 - 20.75in
(51 - 53cm)
21.25 - 22in
(54 - 56cm)
22.5 - 23.25in
(57 - 59cm)
23.5 - 24.25in
(60 - 62cm)
How to Measure:
For best results, use a tape measure to measure around your head where your hat would fit comfortably.

Reviews & Community

What do you think of the

Giro Selector Helmet

? Share a...

Write a review

No file chosen

Rather attach a photo from another website?

Rather attach a photo from your computer?

    Add a:
  • Share a photo
  • Share a video


Only jpg, jpeg, png, gif or bmp files please.

Submit Cancel

Here's what others have to say...

5 5

Consider One Size Larger

  • Gender: Male
  • Familiarity: I've put it through the wringer

The helmet is what I consider a super tight fitting thanks to its ear protection cover. Look at the contour of the helmet you can tell it's a challenge to get your head inside, but that's where it gets its aerodynamic feature. I have to use a shallow tail to fit in. Package contents come also with a shallow tail so you get to choose. Other than being a tight fitting, this is definately a great helmet, state of the art aerodynamic design. I wore it and I am lovin' it. Yes, I am wearing spectacle and still able to fit behind the visor.

Consider One Size Larger
Unanswered Question

What are the equivilant sizes??
I gave a...

What are the equivilant sizes??
I gave a med ionos, should I get a s/m or a m/l???

5 5

Fits great

  • Gender: Male
  • Familiarity: I've used it several times

This helmet is even fast on the trainer! Love how you can customize the helmet yourself with lots of different/ movable parts!

Fits great