KALCT HEATBLOCK Aluminum Silver (Kalct) | Silver heat shield, 100% blackout, lightweight long umbrella, for both sun and rain
A1571
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- Featured in GoodsPress March 2026 Issue
- fashion tech news: The appeal of Amvel's heat-shielding, high-performance parasol
A full-length parasol weighing just about 220g. Enjoy comfortable summer outings with its exceptional lightness and superior heat-shielding performance.
The KALCT HEATBLOCK Aluminum Silver was created to solve the conflicting problems of parasol "weight" and "heat." It is an innovative, high-performance parasol that combines remarkable lightness at approximately 220g with the shade-like coolness provided by a 92.4% heat-shielding rate.
[3 Key Features]
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Full carbon frame for remarkable lightness at "about 220g"
All major parts are made of aircraft-grade carbon. It achieves a weight comparable to that of a lightweight folding umbrella, pursuing a lightness that redefines the full-length umbrella. -
Coolness provided by silver's "92.4% heat-shielding rate"
Reflects sunlight with a special coating. In addition to 100% light blocking, it also blocks 99.9% of near-infrared rays, allowing you to stay surprisingly cool even in the height of summer. -
"Flexible yet strong structure" that withstands wind speeds of 15 m/s
Resilient carbon and resin joints withstand strong winds. It features a durable design that balances lightness and strength, having passed tests at wind speeds of 15 m/s.
[Commitment to Function and Quality]
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High defensive performance that blocks sunlight from multiple angles
Achieves 100% UV protection. It also records a 100% visible light blocking rate to reduce glare, significantly alleviating discomfort caused by the strong summer sun. -
The convenience of a full-length umbrella and smart portability
Designed with a total length of 67 cm, about 17 cm shorter than a standard full-length umbrella. It is a highly convenient size that can be carried smartly, just like a folding umbrella.

Addressing the honest truth of users: “Folding it is a hassle.”
The small daily stress hidden behind convenience
As the summer heat becomes more severe year by year, parasols have become an essential summer item. Looking around the city, many people choose convenient folding umbrellas to carry with them.
However, after more than 30 years of researching umbrellas, I noticed one “honest truth.” It is the genuine stress of “actually, it is a hassle to fold it neatly every time you use it.”
For a quick shopping trip or a short walk to the station, a full-length umbrella that you can quickly close and immediately start walking with should originally be much easier.
Yet, the reason full-length umbrellas are avoided comes down to a single point: “because they are heavy and bulky.”
Approximately 220g. A lightness that overturns the common perception of full-length umbrellas, and heat shielding that surpasses white
“If we can eliminate the weight of a full-length umbrella, summer will be even more comfortable.” This approximately 200g full-length umbrella was born from that conviction.
We combined lightweight carbon fiber, also used in aircraft, with an ultra-thin 0.06mm 20-denier polyester fabric to achieve the lightness of a single smartphone while maintaining the size of a full-length umbrella.
When carried, it is as short and compact as possible, yet when opened, it provides a size that offers peace of mind even on rainy days. Furthermore, we adopted “silver” fabric that physically reflects heat.
This provides a level of coolness equal to or even greater than that of white umbrellas, which are said to have high heat-shielding effects.
A “toughness” that withstands the wind, which folding umbrellas cannot imitate
Also, choosing a full-length umbrella is a return to “strength.” In the sweltering city, I have repeatedly seen people struggling with folding umbrellas that have been blown inside out by the wind.
Folding structures with many joints inevitably have a weakness against the wind. In our comparative experiment, while a typical lightweight folding umbrella turned inside out at a wind speed of 8m/s (a wind strong enough to blow away a hat if not held down), it was proven that this KALCT HEATBLOCK Aluminum Silver can withstand wind speeds of up to 11m/s.
“Freedom from the hassle of folding,” “overwhelming lightness and coolness,” and “strength that can withstand bad weather.” One umbrella that combines all of these will transform your summer travel into a stress-free, free time.
Q: You mention 100% light blocking, but is there any light leakage?
The fabric itself has achieved a 100% light-blocking rate in testing by an inspection agency. However, because umbrellas are made by sewing multiple pieces of fabric together, a small amount of light may be visible through the seams. This is a structural characteristic common to sun umbrellas with high light-blocking performance. Please rest assured that this does not impair the product's heat-shielding effect or UV-cut performance.
Q: Can it also be used as a rain umbrella?
Yes, it can be used as both a sun and rain umbrella. The umbrella fabric itself is confirmed to have high water resistance (water resistance level of 14,940mm), so there is no concern about rainwater soaking through. However, as this product has a special silver coating on the surface prioritized for heat shielding, it does not have the water-repellent finish that causes raindrops to bead up like standard rain umbrellas. Since water droplets tend to remain on the surface after use, please wipe them off lightly and allow the umbrella to dry before storing it.
Q: I have heard that silver coatings peel off easily; is this okay?
Our product aims to achieve both high heat shielding and durability through special coating technology. It has cleared the criteria in abrasion tests by specialized agencies, and the coating will not peel off immediately under normal use. In addition, we have included a "dedicated sleeve" to protect the coated surface from friction and scratches while carrying. By handling the umbrella carefully and storing it in the sleeve, you can maintain its appearance and functionality for longer.
- Product Name: KALCT HEATBLOCK Aluminum Silver
- Main Ribs: 58 cm (8 ribs)
- Size When Open: Diameter Approx. 102 cm / Overall Length 67 cm
- Size When Closed: Overall Length 67 cm / Width Approx. 3 cm
- Weight: Approx. 220 g
- Opening/Closing Operation: Long Umbrella (Manual Opening)
- Light Blocking Rate: 100%
- UV Protection Rate: 100% (UPF50+)
- Heat Shielding Rate: 92.4%
- Visible Light Blocking Rate: 100%
- Near-Infrared Blocking Rate: 99.9%
- Water Resistance: Water Resistance 14,940 mm
- Wind Resistance: Clear at wind speed 15 m/s
- Inversion Limit: Inverts at wind speed 11 m/s, no damage or deformation
- Warranty Period: 1 year from the date of purchase
- Planning and Assembly: Planned in Japan / Assembled in China
■ この傘の特別な特性と取り扱い上のご注意
本製品は、特殊なアルミニウムシルバーコーティングにより、高い遮熱効果と耐久性を両立しています。専門機関による所定の摩耗試験においても、基準をクリアしており、通常のご使用ですぐに剥がれるといったことはございません。しかしながら、鋭利な物や硬い物との強い摩擦や引っかかりが生じた場合、PUコーティングが剥がれたり、傷ついたりする場合がございます。
■ 開く前の準備
傘を開く際は、バンドを外して2〜3回軽く振り、生地と骨を十分にほぐしてから開いてください。生地や骨が絡まった状態で無理に開こうとすると、故障・骨折れの直接的な原因となります。
■ 耐風性能に関するご注意
表示の耐風数値は試験設備内での計測値であり、いかなる強風にも耐えられることを保証するものではありません。
突風や多方向からの風を受ける実際の荒天時には、破損や怪我の原因となりますので、無理なご使用はお控えください。風が強いときは、傘を風上に向けて使用してください。
■ 穴あき・劣化の防止
・圧迫禁止:カバンの中で傘が強く圧迫され続けると、フレームと生地が擦れて穴あきやコーティング剥離の原因となります。
・保管:ご使用後は軽く水気を払い、直射日光を避けて陰干ししてください。濡れたままの放置はカビや錆、生地劣化の原因となります。
■ 機能性検査結果(生地)
当社製品における数値は、第三者検査機関による生地の検査結果です。
・遮光率:JIS L 1055 A法
・紫外線遮蔽率:JIS L 1925
・可視光線カット率:分光光度計法 / 400-800nm
・近赤外線カット率:分光光度計法 / 800-2600nm
※上記は試料(生地)に対する検査結果であり、製品全体の性能を保証するものではありません。縫製部(ミシン目)からの微量の光漏れや、地面からの照り返しにより内側に光が届くことがあります。
■ 開封時のにおいについて
開封直後、遮光生地のコーティング(PU)特有のにおいがする場合がありますが、不良ではありません。
気になる場合は、傘を開いて通気性の良い場所で数時間陰干ししていただくと軽減されます。
