Giro  Synthe Mips II Bike Helmet

$118.73Compared to $200.00*Save 40%
HURRY! This item is discontinued. Shop now for best selection.

Designed for road and gravel riders alike, the Giro Synthe Mips II bike helmet combines the performance advantages of a compact profile with great cooling power and exceptional comfort.

Color: Matte Black Underground
Size: S
Quantity
Shipping restrictions apply.

Features

  • Integrated Mips® brain protection system; the goal of integrated Mips-equipped Giro helmets is to reduce rotational forces
  • Giro believes that helmets equipped with Mips technology can reduce the amount of rotational force that may be transferred to a rider's brain in certain impacts
  • All Giro helmets are designed to reduce as much energy as possible while meeting and exceeding stringent safety standards
  • Proprietary Wind Tunnel ventilation system combines active vents in the shell with exhaust channels inside that thrust cool air over and around the head while forcing heat out
  • Roll Cage light-yet-tough web of reinforcement is invisibly molded inside the EPS foam liner for extra strength and integrity that helps the helmet hold together under impact
  • Micro-adjustable, ergonomic and compact dial allows you to adjust vertical positioning and tune the contact points independently for a customized fit with exceptional comfort
  • Dial also helps optimize stability and cooling airflow through the helmet
  • IONIC+ padding with pure silver, the secret ingredient that gives it the power to provide natural, permanent odor protection and keeps your helmet feeling fresh
  • Size medium weighs 9.7 oz. (275 g)
  • CPSC and CE EN1078 certifications

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 Road Bike Helmets

Technical Specs

Best Use

Road Cycling

Helmet Style

Road Bike

Helmet Construction

In-mold

Shell Material

Polycarbonate

Head Circumference

S: 20-21.7 inches

Vents

19

Visor/Brim

No

Weight

9.7 ounces

Gender

Unisex

Buying Advice

Reviews
5 reviews with an average rating of 2.6 out of 5 stars

33% 1 of 3 reviewers recommended

Write a Review

Adding a review will require a valid email for verification

Customer Images

Spencer
Location:Ontario, Canada
Age:25–34
Rated 3.0 out of 5 stars
6 months ago

Nice helmet on sale

Nice helmet on sale, but I was sent one with a bent MIPS liner and will have to return/exchange. To correct the other reviewers: A replacement helmet is recommended after 3-5 years OF USE. A brand-new helmet sitting in it's original packaging, not exposed to wild temperatures, sun, sweat, or sunscreen is fine, and you can begin your 3-5-year countdown after you purchase it.

Age:25–34
SSL
Age:25–34
Rated 1.0 out of 5 stars
7 months ago

Old Helmets

REI sent a helmet produced in 2021, these are supposed to be replaced 5 years from production so now this helmet is technically only good for 1 more year...

Age:25–34
S4n
Location:Mexico
Age:25–34
Rated 5.0 out of 5 stars
8 months ago

Light and comfortable

Light and comfortable, good fit

Age:25–34
Spencer
Rated 3.0 out of 5 stars
6 months ago

Good buy on sale

Nice helmet that fits well. Unfortunately, I was sent one with a bent MIPS liner, and will have to return/exchange. A note to anyone considering purchasing an older model helmet: Replacement is only recommended after 3-5 years OF USE. A brand-new, unused helmet sitting in its original packaging, not exposed to sun, sweat, and sunscreen is fine.

Eric
Age:45–54
Rated 1.0 out of 5 stars
7 months ago

Old manufacture date

The helmet is great, but it was manufactured in 2021. (I purchased it in March 2025.) Depending on when you retire your helmets this may already be expired. I returned it without an issue.

Age:45–54

Questions & Answers

Loading Questions...