Sold Out Last Year! Zero-Energy "Heat-Cooling" Parasol Returns This Season! All-Weather "esta REIKYAKU Parasol" Now On Sale
Moonbat Co., Ltd. is launching the "esta REIKYAKU Parasol," an all-weather umbrella developed jointly with RadiCool Japan Co., Ltd., featuring zero-energy cooling. This popular product, which sold out last year due to the intense heat, returns this season with "RadiCool T-series" radiation cooling material, achieving a maximum temperature difference of 34℃ to combat heatstroke.
📋 Article Processing Timeline
- 📰 Published: April 23, 2026 at 23:00
- 🔍 Collected: April 23, 2026 at 14:31
- 🤖 AI Analyzed: April 23, 2026 at 22:07 (7h 35m after Collected)
※Maximum temperature difference from unprocessed fabric in product heat shielding performance evaluation test using artificial solar lighting. Effects may vary depending on the usage environment.
Moonbat Co., Ltd. (Headquarters: Shimogyo-ku, Kyoto; Representative Director: Hisashi Kamata; hereinafter "Moonbat") will launch the all-weather parasol "REIKYAKU Parasol" using the radiation cooling material "RadiCool T-series," developed jointly with RadiCool Japan Co., Ltd. (Headquarters: Chuo-ku, Tokyo; President: Jun He). This highly anticipated series, which sold out faster than expected last year due to recent intense heat, will be available this season to meet further demand for heatstroke prevention.
■ Development Background
In recent summers, perceived temperatures have risen due to complex factors, including not only direct sunlight but also reflected heat from the ground and buildings, and heat stagnation from trapped air. According to data from the Japan Meteorological Agency, sea surface temperatures near Japan and average national temperatures in 2025 have remained high, indicating a clear normalization of intense heat. With severe heat also expected in 2026, the importance of early measures before the season fully begins is increasing.
※In 2025, Tokyo observed high average maximum temperatures exceeding normal values for all months. ※[Source] Japan Meteorological Agency "Past Weather Data Search" "Normal Values (Monthly Values)"
Furthermore, conventional parasols were primarily designed to block direct sunlight (shading/heat shielding). However, when the fabric itself absorbed solar radiation and became hot, that radiant heat would transfer to the inside of the umbrella, contributing to an increase in perceived temperature. Under today's harsh weather conditions, the traditional approach of "just blocking sunlight" is becoming insufficient.
To address these challenges, our company adopted the innovative radiation cooling fabric provided by RadiCool Japan Co., Ltd. This product is an officially approved product using "RadiCool" radiation cooling technology, which cools objects with zero energy. By not only reflecting sunlight but also lowering the umbrella's surface temperature and suppressing heat transfer to the inside, it provides a comfortable coolness, as if you are in a moving "shade."
※Products excluding the lightweight type are designed to withstand strong winds.
■ What is the radiation cooling material "RadiCool"?
"RadiCool" radiation cooling material is a technology that efficiently radiates absorbed heat outwards without using energy. It combines high solar reflectance and heat dissipation characteristics, concentrating heat radiation into the "atmospheric window (8-13μm band)." This spectral control enables heat exchange with the atmosphere even during the day, suppressing heat accumulation on the product surface.
▼ "REIKYAKU Parasol" video now available on YouTube
We clearly introduce the amazing heat shielding and cooling effects brought by the radiation cooling material in a video. Please take a look.
https://www.youtube.com/watch?v=5EasbgLpst0
▼ Experimental video of "RadiCool" radiation cooling technology's cooling effect
https://www.youtube.com/watch?v=6OkC9NOeC6s
■ Pursuing the highest level of radiation cooling performance: Adoption of "T-series" fabric
This product adopts the "T-series" fabric, which maximizes radiation cooling performance among Radi-Cool fabrics. This structure allows for maximum radiation cooling performance and minimizes heat accumulation in the fabric.
■ Product Features
1. Proven amazing temperature difference of "up to 34℃." Clearly visible temperature difference
The "REIKYAKU Parasol" recorded a maximum temperature difference of 34℃ in product heat shielding performance evaluation tests. It also obtained an evaluation of 【S65+】 with a heat shielding index of over 65%, which is a top-class value. Furthermore, thermography tests observed a temperature difference of -11.9℃ on the top of the head and -3.2℃ on the right shoulder. This visualizes that even outdoors in strong sunlight, the inside of the umbrella does not get hot, and heat is effectively suppressed from the head to the shoulders. You can experience its overwhelming "coolness" even during short outings.
2. Thorough protection from sun and rain. "100% light blocking and 100% UV cut"
In addition to the outermost "RadiCool" layer, a multi-layered structure with a high-density light-blocking coating physically blocks light and UV rays.
・100% light blocking and UV cut rate (UPF50+)
It is ideal not only for sun protection but also for eye strain and heatstroke prevention caused by strong sunlight.
・All-weather compatible "sun and rain umbrella"
Equipped with high water repellency, it can handle sudden rain. It can be used regardless of the weather.
Test methods... Heat shielding effect: JISL1951 / Light blocking rate: JISL1055A method / UV cut rate/UPF value: JISL1925
The stated numerical values are measured values for the fabric condition. They do not represent the performance of the entire umbrella.
3. Wind-resistant structure for peace of mind even in sudden winds (excluding 50cm type)
Wind resistance test in wind
Moonbat Co., Ltd. (Headquarters: Shimogyo-ku, Kyoto; Representative Director: Hisashi Kamata; hereinafter "Moonbat") will launch the all-weather parasol "REIKYAKU Parasol" using the radiation cooling material "RadiCool T-series," developed jointly with RadiCool Japan Co., Ltd. (Headquarters: Chuo-ku, Tokyo; President: Jun He). This highly anticipated series, which sold out faster than expected last year due to recent intense heat, will be available this season to meet further demand for heatstroke prevention.
■ Development Background
In recent summers, perceived temperatures have risen due to complex factors, including not only direct sunlight but also reflected heat from the ground and buildings, and heat stagnation from trapped air. According to data from the Japan Meteorological Agency, sea surface temperatures near Japan and average national temperatures in 2025 have remained high, indicating a clear normalization of intense heat. With severe heat also expected in 2026, the importance of early measures before the season fully begins is increasing.
※In 2025, Tokyo observed high average maximum temperatures exceeding normal values for all months. ※[Source] Japan Meteorological Agency "Past Weather Data Search" "Normal Values (Monthly Values)"
Furthermore, conventional parasols were primarily designed to block direct sunlight (shading/heat shielding). However, when the fabric itself absorbed solar radiation and became hot, that radiant heat would transfer to the inside of the umbrella, contributing to an increase in perceived temperature. Under today's harsh weather conditions, the traditional approach of "just blocking sunlight" is becoming insufficient.
To address these challenges, our company adopted the innovative radiation cooling fabric provided by RadiCool Japan Co., Ltd. This product is an officially approved product using "RadiCool" radiation cooling technology, which cools objects with zero energy. By not only reflecting sunlight but also lowering the umbrella's surface temperature and suppressing heat transfer to the inside, it provides a comfortable coolness, as if you are in a moving "shade."
※Products excluding the lightweight type are designed to withstand strong winds.
■ What is the radiation cooling material "RadiCool"?
"RadiCool" radiation cooling material is a technology that efficiently radiates absorbed heat outwards without using energy. It combines high solar reflectance and heat dissipation characteristics, concentrating heat radiation into the "atmospheric window (8-13μm band)." This spectral control enables heat exchange with the atmosphere even during the day, suppressing heat accumulation on the product surface.
▼ "REIKYAKU Parasol" video now available on YouTube
We clearly introduce the amazing heat shielding and cooling effects brought by the radiation cooling material in a video. Please take a look.
https://www.youtube.com/watch?v=5EasbgLpst0
▼ Experimental video of "RadiCool" radiation cooling technology's cooling effect
https://www.youtube.com/watch?v=6OkC9NOeC6s
■ Pursuing the highest level of radiation cooling performance: Adoption of "T-series" fabric
This product adopts the "T-series" fabric, which maximizes radiation cooling performance among Radi-Cool fabrics. This structure allows for maximum radiation cooling performance and minimizes heat accumulation in the fabric.
■ Product Features
1. Proven amazing temperature difference of "up to 34℃." Clearly visible temperature difference
The "REIKYAKU Parasol" recorded a maximum temperature difference of 34℃ in product heat shielding performance evaluation tests. It also obtained an evaluation of 【S65+】 with a heat shielding index of over 65%, which is a top-class value. Furthermore, thermography tests observed a temperature difference of -11.9℃ on the top of the head and -3.2℃ on the right shoulder. This visualizes that even outdoors in strong sunlight, the inside of the umbrella does not get hot, and heat is effectively suppressed from the head to the shoulders. You can experience its overwhelming "coolness" even during short outings.
2. Thorough protection from sun and rain. "100% light blocking and 100% UV cut"
In addition to the outermost "RadiCool" layer, a multi-layered structure with a high-density light-blocking coating physically blocks light and UV rays.
・100% light blocking and UV cut rate (UPF50+)
It is ideal not only for sun protection but also for eye strain and heatstroke prevention caused by strong sunlight.
・All-weather compatible "sun and rain umbrella"
Equipped with high water repellency, it can handle sudden rain. It can be used regardless of the weather.
Test methods... Heat shielding effect: JISL1951 / Light blocking rate: JISL1055A method / UV cut rate/UPF value: JISL1925
The stated numerical values are measured values for the fabric condition. They do not represent the performance of the entire umbrella.
3. Wind-resistant structure for peace of mind even in sudden winds (excluding 50cm type)
Wind resistance test in wind