Maximize the heat-shielding effect of your parasol! A complete guide to choosing the right color and using it effectively.

With the intense heat of July continuing, the term "heat shielding" is gaining attention as people look for ways to stay cool. However, are you choosing your parasol based solely on the numbers in a spec sheet?

While you might expect that "higher heat shielding means more cooling," from the perspective of a maker, I want to share the importance of "smart usage" that goes beyond mere numbers. In this article, we will unravel the essential wisdom for maximizing your parasol’s potential to lower your perceived temperature.

Heat shielding values and the reality of "perceived" temperature

Generally, a heat shielding rate of 35% or higher in fabric testing is recognized as having a "heat shielding effect," and some products show high values exceeding 65%.

However, on scorching days exceeding 35°C (95°F), it is actually very difficult to clearly feel the difference between a 35% and 65% heat shielding rate. Understanding the mechanisms of heat dissipation and the properties of colors is a more effective shortcut to "staying cool" than focusing too much on the numbers.

"White" reflects, "black" absorbs

The principle of heat shielding is easy to understand if you imagine a car in a parking lot in midsummer. A black car gets hotter inside than a white car because black has the property of "absorbing" heat, while white has the property of "reflecting" it.

Similarly, bright colors like white or silver tend to have higher heat shielding numbers because they reflect heat easily. In contrast, black fabric may look disadvantageous on paper because it absorbs heat. However, there is no need to give up on your favorite black parasol. The key is creating a "space" that prevents the absorbed heat from reaching your body.

The "15cm gap" that creates coolness

The biggest factor in the heat shielding effect of a parasol is the "space" between the umbrella and your head.

Are you holding the umbrella too low because you’re worried about sunburn? If the fabric is too close to your head, the heat stored by the fabric will be transferred directly to your head, and heat will become trapped under the canopy. An increase in body temperature can lead not only to the risk of heatstroke but also have a negative impact on your skin condition.

Ideally, you should maintain a gap of about 15–20 cm between the umbrella and your head. Creating this layer of air helps block heat transfer from the fabric, effectively lowering your perceived temperature while protecting your skin.

A heat-shielding style completed by wearing a "hat"

While a parasol is a powerful weapon against direct sunlight from above, it cannot completely block the intense "reflected heat" coming from the ground.

This is why I recommend using a hat in combination with your parasol. A hat blocks light from gaps that the parasol cannot cover, and acts as a barrier that prevents any heat trapped under the umbrella from transferring directly to your head. By combining this with arm covers and other accessories, you can reduce total heat damage to your entire body.

Ultimately, rather than worrying about a few percentage points of difference in numbers, choosing "a favorite you'll want to use every day" and using it correctly is the most reliable way to protect yourself from heatstroke and UV rays.