HYOD STJ317D ST-S UCHIMIZU D3O AIR COOL DRY MESH PARKA UCHIMIZU Jacket The "UCHIMIZU" series uses cooling materials that utilize "latent heat of vaporization." "Latent heat of vaporization" is the heat absorbed from the surroundings when a liquid substance turns into a gas. This is why sprinkling water on roads and gardens in the hot summer, a practice called "uchimizu," makes the heat more bearable and easier to spend time in. It is equipped with soft and flexible D3O protectors for the shoulders, elbows, and back, which provide amazing impact absorption. The shoulders and elbows feature "D3O AIR protectors" that combine safety and breathability, and the back features a "BP4 L1" protector, achieving both comfortable wear and high-spec safety performance. Of course, all of these protectors meet the stringent European safety standard "CE standard." If you are concerned about the hood flapping due to high-speed driving, you can fold the hood compactly. Being able to use it differently depending on the driving scene, such as on highways, your preference, and the TPO (time, place, occasion) is also a feature of the hooded style. There is some sun fading, but it is usable.