一、遮陽傘的材料：應是能夠阻擋紫外線（UV）的物質，好是緞子、滌綸或其他的微纖維材料。如果為了起見，可以選擇滌綸材料。一般材料/面料越厚，提供的保護就越好。從遮陽與防紫外線的效果來看，建議選用表面為雙遮陽布的遮陽傘，因為兩層之間的隔熱效果，傘下溫度很難上升，這樣可以保護我們的皮膚。同時，雙層布的遮陽傘過濾紫外線效果也比單層布的要好。

1、 The material of the sunshade umbrella should be a substance that can block ultraviolet rays (UV), such as satin, polyester, or other microfiber materials. If for safety reasons, polyester material can be chosen. The thicker the material/fabric, the better the protection provided. From the perspective of shading and UV protection effects, it is recommended to choose a sunshade umbrella with a double sunshade cloth surface, because the insulation effect between the two layers makes it difficult for the temperature under the umbrella to rise, which can protect our skin. Meanwhile, the sunshade umbrella made of double-layer fabric also has better UV filtering effect than that of single-layer fabric.

二、遮陽傘的顏色：任何有紫外線防護指數的傘都有阻擋有害輻射的能力，不過在面料相同的情況下，深色的傘防紫外線效果更好，一般深色的傘布可以遮擋掉95%的UVA。

2、 The color of sunshade umbrellas: Any umbrella with a UV protection index has the ability to block harmful radiation. However, when the fabric is the same, dark umbrellas have better UV protection effects. Generally, dark umbrella fabrics can block 95% of UVA.

UVA波段是紫外線波長劃分的一部分，波長320～420nm，又稱為長波黑斑效應紫外線，它有很強的穿透力，UVA可以直達肌膚的真皮層，破壞彈性纖維和膠原蛋白纖維，將皮膚曬黑。黑色纖維材料的傘比其他的傘的遮擋UVA的效果更突出。因為黑色可以大限度地吸收光線。其實，除了直射的陽光紫外線外，地面反射的紫外線也會灼傷皮膚，黑傘也可以吸收地面反射的紫外線。

The UVA band is a part of the wavelength division of ultraviolet radiation, with wavelengths ranging from 320 to 420nm, also known as long wave black spot effect ultraviolet radiation. It has strong penetration power and can directly reach the dermis of the skin, damaging elastic fibers and collagen fibers, and tanning the skin. Umbrellas made of black fiber material have a more prominent effect in blocking UVA than other umbrellas. Because black can absorb light to the fullest extent. In fact, in addition to direct sunlight and ultraviolet rays, the reflected ultraviolet rays from the ground can also burn the skin, and black umbrellas can absorb the reflected ultraviolet rays from the ground.

三、遮陽傘的防曬指數（UPF）：確保你買的傘有必要的“保護標記”。要知道，任何紫外線防曬指數大于30 (UPF 30+)的材料，以及限制紫外線穿透在5%或更少的范圍內的遮陽傘都能起到抵御紫外線輻射的作用。旅行時，要使用UPF 50+的遮陽傘。當然，UPF值夠用就好，不要一味聽賣家忽悠。另外，買高UPF的傘好讓賣家出示下檢驗報告，尤其網購的時候，防止花冤枉錢。

3、 Sun Protection Index (UPF) of Umbrella: Ensure that the umbrella you buy has the necessary "protective markings". It should be noted that any material with a UV sun protection index greater than 30 (UPF 30+), as well as sunshades that limit UV penetration to 5% or less, can resist UV radiation. When traveling, use a UPF 50+sunshade umbrella. Of course, as long as the UPF value is sufficient, don't just listen to the seller's deception. In addition, buying umbrellas with high UPF allows sellers to present inspection reports, especially when shopping online, to prevent wasting money.

四、遮陽傘的涂層：傘的反射面積很大，傘布內面好有黑色的涂層，以避免再次反射地面的UVA臉部。現在市面上的遮陽傘多以黑膠為主，銀膠相對于黑膠而言，具有容易脫落、防曬效果一般的缺點，而品質好的黑膠透光率可以達到幾乎為0，劣質的黑膠涂層可能含有致癌物質，對身體造成傷害。遮陽傘中涂層主要是增加抗紫外線的功能，其實質的抗紫外線的物質主要是二氧化鈦。

4、 Coating for sunshade umbrellas: The umbrella has a large reflective area, and the inner surface of the umbrella fabric should have a black coating to avoid reflecting UVA from the ground to the face again. Nowadays, sunshade umbrellas on the market are mainly made of black glue. Compared to black glue, silver glue has the disadvantages of easy detachment and average sun protection effect. However, high-quality black glue can have a light transmittance of almost 0, and low-quality black glue coatings may contain carcinogens, which can cause harm to the body. The main function of the coating in sunshades is to increase their UV resistance, and its essential anti UV material is mainly titanium dioxide.

現在市場上宣傳的納米涂層也就是在織物纖維的內部摻入吸收紫外線的材料，或是在織物完成以后做后期整理，滲入一些吸收紫外線的材料，如納米級的氧化鋅或二氧化鈦等，并無其他特別之處，所以關鍵仍然是遮陽傘中抗紫外線物質的含量的多少。綜合以上所有建議好選擇黑膠涂層的遮陽傘。

The nano coating currently promoted in the market refers to the addition of materials that absorb ultraviolet rays into the interior of fabric fibers, or the infiltration of some materials that absorb ultraviolet rays after finishing the fabric, such as nanoscale zinc oxide or titanium dioxide, without any other special features. Therefore, the key is still the amount of anti ultraviolet substances in the sunshade umbrella. Based on all the above suggestions, it is recommended to choose a sunshade umbrella with a black adhesive coating.

五、遮陽傘的大小：當你在長期在戶外選擇撐傘的時候，要選擇直徑較大的傘，以提供大的保護和小的曝光量。因為紫外線是從各個方向照射的，所以面積越大，能抵擋紫外線的效果越好。所以，挑選時好撐開看看面積大小。這也是為什么我們即使打著遮陽傘，依然要涂防曬霜的原因。

5、 The size of a sunshade umbrella: When choosing to hold an umbrella outdoors for a long time, choose an umbrella with a larger diameter to provide greater protection and lower exposure. Because ultraviolet rays are irradiated from all directions, the larger the area, the better the ability to resist ultraviolet rays. So, when choosing, it's good to spread it out and see the size of the area. This is also why we still need to apply sunscreen even when holding a sunshade umbrella.

六、傘架或傘骨：傘架或傘骨是使遮陽傘保持穩定的。傘架是傘的核心部件，好的傘架要做到防銹、輕便、牢固、推拉順暢。就材料而言，好的材料應該是碳纖維，輕而堅固；其次是鋁合金，也是現在市面上多的一種。另外，中桿截面的邊越多越好，雙層套管比單層好。

6、 Umbrella frame or ribs: Umbrella frames or ribs are used to keep sunshades stable. The umbrella frame is the core component of an umbrella, and a good umbrella frame should be rust proof, lightweight, sturdy, and smoothly pushed and pulled. In terms of materials, a good material should be carbon fiber, which is light and sturdy; Next is aluminum alloy, which is also one of the most common types on the market today. In addition, the more edges in the cross-section of the middle rod, the better, and double-layer casing is better than single-layer casing.

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