New Trip Updated: 2026.04.15

A parasol alone isn't enough? Heatstroke prevention priorities to know before your Golden Week outings

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Golden Week is just around the corner.

It's a season when travel and outings are exciting, but heatstroke is a concern during long hours outdoors.

Do you think, "I'm fine because I'm using a parasol"? In fact, a parasol is just one measure against heatstroke. In this article, we will clearly explain the correct priority of measures and the true role of parasols.

table of contents

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1. Why does heatstroke occur?

2. How effective are parasols?

3. Prioritizing Heatstroke Prevention Measures

4. Which is better: a parasol or a hat?

5. Special attention should be paid to these locations and scenarios!

6. GW Pre-Trip Checklist

7. Summary

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一、熱中症はなぜ起こる？夏の外出で注意したい原因

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When you spend a long time outdoors during Golden Week trips or outings, your body can gradually approach its limits.

This is heatstroke.

 

Heatstroke occurs when the body's internal heat cannot escape properly in a high temperature and humidity environment, causing an abnormal rise in body temperature. While mild symptoms might just be a general feeling of sluggishness or a heavy head, severe cases can lead to loss of consciousness, making it a serious condition that shouldn't be underestimated.

 

What's particularly important to note is that even before you feel "hot," heat may already be accumulating inside your body. Taking preventative measures before symptoms appear is paramount.

・熱中症が起こる主な原因

  • High Temperatures
    When temperatures exceed 30℃, the body's thermoregulatory functions can no longer keep up.
    The danger escalates sharply, especially on extremely hot days exceeding 35℃.
  • Humidity
    High humidity makes it difficult for sweat to evaporate, hindering the body's ability to cool down.
    Even if the temperature is low, high humidity increases the risk of heatstroke.
  • Direct Sunlight
    Continuous exposure to sunlight causes a rapid increase in body surface temperature, making it easier for heat to accumulate inside the body.
  • Dehydration
    Insufficient fluid intake can lead to dehydration, impairing the body's ability to regulate temperature.

・特に注意すべきポイント

When going out, it's not just the "air temperature" but also the "increase in body temperature due to sun exposure" that places a significant burden on you.

Walking for just 30 minutes in the scorching sun can raise your body temperature by 2 to 3°C.

 

For this reason, many people tend to think, "I'll be fine with a parasol," but

is a parasol truly sufficient on its own?
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二、日傘は熱中症対策にどれくらい効果がある？

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・日傘のメリット

In short, a parasol is a very effective item for preventing heatstroke.

However, it is not foolproof.

 

A parasol has two main effects:

  • The first is to cut ultraviolet (UV) rays.
    It prevents damage to the skin while also suppressing the direct warming of the body's surface by sunlight.
  • The second is its heat-shielding effect.
    A parasol with heat-shielding treatment can lower the perceived temperature under the umbrella by up to 5-8°C.

On the other hand, what a parasol cannot prevent is "heat from the surroundings." The glare from asphalt, radiant heat from building walls, and the high temperature itself cannot be blocked by a parasol. The most dangerous thing is to become overconfident and think, "I'm fine because I'm using a parasol."

・日傘だけでは不十分なケース

However, parasols are not a complete safeguard against heatstroke.

In the following situations, a parasol alone is not sufficient:

  • Extreme heat days when temperatures exceed 35℃: Even with the shade provided by a parasol, the ambient temperature is too high for the body to cool down easily.
  • Days with high humidity where sweat does not evaporate easily: The body's thermoregulatory function is impaired, leading to heat buildup.
  • Spending long periods outdoors (2 hours or more): A parasol alone cannot prevent physical exhaustion.
  • Not staying hydrated: The effectiveness of a parasol is limited when dehydrated.

A parasol is one means of "avoiding heat," and it is important to combine it with hydration, rest, and appropriate clothing.

・日傘を選ぶときのポイント

While parasols are an effective way to "avoid the heat," choosing the right one is also important.

  • Lightweight: Won't tire you out even if carried for long periods
  • Compact: Easy to take on trips
  • All-weather: Can handle sudden rain
  • UV Cut / Light Blocking Rate: Effectively blocks UV rays and heat

MONOMI's parasol 7105 meets these criteria, making it ideal for heat protection during travel and outings.

It is lightweight and portable, and boasts a 99% UV cut rate and 100% light blocking rate.

So, what other measures are needed besides a parasol?

Monomi 7105 折りたたみ日傘

遮光100％・遮熱18°C効果

Monomi 7105 折りたたみ日傘

約185g｜完全遮光・UPF50+

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¥1,980

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三、熱中症対策の優先順位｜3つのポイントで考える

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So, what's the correct order of priorities? Consider the following:

  • 1st: Hydration and Electrolyte Replacement (Highest Priority)
    　Replenishing your body's water and electrolytes is the absolute fundamental for preventing heatstroke. The trick is to drink frequently before you feel thirsty. A guideline is around 200-300ml per hour. Sports drinks and oral rehydration solutions are recommended as they also replenish salt.
  • 2nd: Resting in a Cool Place
    　It's important to avoid direct sunlight and regularly rest your body in the shade or an air-conditioned area. Make sure to find a cool place every 30-60 minutes.
  • 3rd: Breathable Clothing and a Hat
    　Clothes made of breathable materials and wide-brimmed hats help mitigate rising body temperatures. Protecting the back of your neck is particularly effective.
  • 4th: Parasol
    　This is where a parasol comes in. It's a very effective item that blocks direct sunlight, lowering your perceived temperature, and also provides UV protection. However, the correct way to use it is as something that further enhances the effects, after you've already taken care of the top three priorities.
  • 5th: Utilizing Cooling Products
    　Cooling sprays and cooling towels worn around the neck can temporarily lower body temperature. They are effective when combined with a parasol.
優先度 対策 具体的な方法
① 最優先 暑さを避ける 日陰を選ぶ・日傘を使う・帽子をかぶる
② 重要 体温上昇を防ぐ 通気性の良い服・冷却グッズ・こまめな休憩
③ 必須 水分・塩分補給 こまめに水分を取る・塩分タブレット

First, by "avoiding the heat," we minimize the rise in body temperature.

Then, we make efforts to "prevent body temperature from rising," and finally, we maintain the body's balance by "replenishing fluids and salt."

・日傘・帽子・冷却グッズはどう使い分ける？

The effectiveness of heatstroke prevention items increases when used appropriately for each situation.

アイテム 向いている場面 旅行での使い分け例
日傘 長時間屋外にいる 観光地を歩く・並んで待つ
帽子 両手を空けたい時 スーツケースを引く・写真を撮る
冷却グッズ 猛暑日・長時間移動 駅から駅への移動・バス待ち

Instead of choosing "either one or the other," a parasol and a hat can be used interchangeably depending on the situation, allowing you to enjoy your trip more comfortably.

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四、夏の旅行・お出かけで特に注意したい場面と対策

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① 駅までの徒歩移動

We often get asked, "Should I choose a parasol or a hat?" The answer is "both."

A hat directly covers your head and has the advantage of keeping your hands free.

On the other hand, a parasol's strength is that it can create a wide shade not only for your head but also for your shoulders and arms.

In particular, a parasol with heat-shielding treatment can greatly reduce heat damage to your entire body.

 

When traveling, there are many situations where you use both hands, such as holding a camera or looking at a map.

In such cases, the best way to protect both your head and body is with a combination of a hat and a parasol.

② 観光地で長時間並ぶ

At theme parks and popular tourist destinations, you may have to wait in line for long periods under the scorching sun.

Countermeasures:

  • A parasol is ideal (it provides shade for an extended period)
  • Drink water frequently
  • Look for shaded or covered areas even while waiting in line

③ スーツケースを引いて移動する時

While traveling, you often find yourself moving around while pulling a suitcase.

At this time, it becomes difficult to use a parasol as both hands are occupied.

Countermeasures:

  • Wear a hat
  • Take frequent breaks and hydrate in cool places
  • Heavy luggage can deplete your stamina and increase the risk of heatstroke, so choose a lightweight suitcase
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New Trip offers lightweight suitcases ideal for summer travel.

Choosing a lightweight and easy-to-pull model reduces physical exhaustion during travel and lowers the risk of heatstroke.

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五、夏のお出かけ前チェックリスト

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Knowing the situations where heatstroke is likely to occur will help you know when to step up your preventative measures.

  • Outdoor Tourist Attractions/Queues
    　Standing for long periods under direct sunlight carries a very high risk of heatstroke. Make sure to use a parasol and hydrate yourself.
  • Beach/Riverside
    　Areas near water have strong reflections, which can make the perceived temperature feel much higher. In addition to a parasol, frequent hydration and resting in the shade are essential.
  • Car/Bus During Travel
    　The inside of a stopped vehicle can quickly become very hot. Furthermore, the significant temperature difference between an air-conditioned vehicle and the outside air can also strain your body. Make it a habit to hydrate every time you get on or off.
  • Traveling with Children/Elderly
    　Children and the elderly, whose thermoregulatory functions are underdeveloped or declining, are more susceptible to heatstroke. It's important to actively encourage them to rest and hydrate even before they complain of feeling hot.

Use this checklist to enjoy a safe and comfortable summer outing.

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六、よくある質問

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Q1. 日傘だけで熱中症は防げますか？

A1：日傘は直射日光を防ぎ、体感温度を下げる効果がありますが、完全に熱中症を防ぐものではありません。
水分補給・休憩・涼しい服装と組み合わせることが大切です。

Q2. 日傘と帽子、どちらが熱中症対策に効果的？

A2：どちらも効果的ですが、使い分けが重要です。
長時間屋外にいるなら日傘、両手を空けたいなら帽子がおすすめです。
シーンに応じて使い分けましょう。

Q3. 旅行中に熱中症になったらどうすればいい？

A3：すぐに涼しい場所（エアコンのある室内・日陰）に移動し、水分・塩分を補給してください。
症状が改善しない場合は、すぐに医療機関を受診しましょう。
めまい・立ちくらみ・頭痛・吐き気などの初期症状を見逃さないことが大切です。

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七、まとめ

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Parasols are indeed a reliable item when it comes to preventing heatstroke.

However, they truly show their effectiveness when combined with basic measures such as hydration and taking breaks.

 

This year's Golden Week, please enjoy your trip energetically by preparing your countermeasures in the correct order.

We would be delighted if New Trip's parasol could become a strong companion on your journey.

執筆・監修

New Trip編集部
本記事は、スーツケース・旅行用品ブランド「New Trip」の編集部により制作されました。
製品開発やユーザーの声を活かしながら、ユーザーに合ったスーツケースや、旅行・出張をより快適にするアイテムを発信しています。

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