Giro Synthe MIPS II sisak S (51-55cm) matte black

Giro's classic that has impressed many cycling fans for years. And now the Synthe II road bike helmet gets an update for even more comfort and more ventilation with the Roc Loc® 5 Air Fit system with MIPS® technology. This improves protection in the event of a fall, which is important for such an aerodynamic helmet.

In-mold polycarbonate shell
With the in-mold construction, the robust polycarbonate outer shell is bonded to the impact-absorbing EPS inner shell in one operation while foaming. The helmet becomes tougher without any additional weight. This production process also makes it possible to form significantly better ventilation systems and vents. Compared to traditional helmets, in-mold helmets are lighter and have significantly better ventilation systems.

RollCage™
The Roll Cage™ is a reinforcement made of high-impact Nylon® that is embedded directly in the EPS inner foam of our best helmets. It provides an extra level of stability and security.

Roc Loc® 5 adjustment system
The new benchmark in fitting systems is undoubtedly the Roc Loc® 5 fitting system. The adjustment mechanism is in a mini housing, the size adjustment is easy and in micro-rasters with two fingers. In addition, the system can be adjusted in height so that the helmet fits perfectly.

Wind Tunnel™
Wind Tunnel™ ventilation is Giro's proprietary system of internal channels and active vents that direct cool, fresh air over and around your head, pushing out exhausting heat and stale air. A difference you can see and feel - on every ride.

MIPS
The MIPS® safety system was developed to provide additional protection for helmets in numerous accidents. In certain impact situations, the MIPS system can reduce dangerous forces that might otherwise be transmitted to the helmet wearer's head.

1. Conventional helmets are designed and tested for a straight impact. In most cases, however, the impact is at an angle, which can cause rotational movements for the head.

2. This rotational movement can cause brain injury.

3. The low-friction shell is designed to help reduce rotational movement of the head in certain cases of angled impact.

Straight impact - oblique impact

The brain is typically more sensitive to rotational movement than linear movement because it has a shear strength similar to that of water or gel. When rotational movement causes different parts of the brain to move at different times, the tissues can be stretched, causing concussions or other brain injuries.

Rotational motion is a common cause of concussion and more serious brain injury from an oblique impact to the head. The MIPS system consists of a low-friction shell that is fixed inside the helmet. The low-friction shell is designed to slide slightly inside the helmet in the event of an accident, allowing forces to be directed away from the head. It is said to help reduce the risk of brain injuries.

Most conventional helmets are designed for a straight impact, but in most cases the impact is at an angle. The low-friction shell can reduce the rotational forces of an oblique impact.

Security system with the brain as a model

Unlike conventional helmets, which are primarily designed and tested for a straight impact, the low-friction shell of the MIPS system mimics the brain's own protection system against rotational movement. The cerebrospinal fluid is our natural defense system that allows the brain to move offset to the skull.