Core Viewpoint - The article emphasizes the importance of sun protection products during high-temperature weather, providing guidance on selecting sunscreen clothing, creams, and sprays for effective UV protection [1]. Group 1: Sunscreen Clothing - Suitable for outdoor activities like hiking and cycling [2] - Advantages include physical protection without chemical sunscreen, making it suitable for children, pregnant women, and sensitive skin [1] - Disadvantages include limited coverage, potential for poor breathability leading to skin issues, and the need for careful washing to maintain UPF [1][2] Group 2: Sunscreen Cream - Ideal for facial protection and long-lasting effectiveness [5] - Key selection criteria include SPF and PA values, with SPF 50 blocking 98% of UVB rays and PA+++ or PA++++ recommended for strong UV environments [6][10] - Disadvantages include the need for manual application and potential makeup disruption [5][6] Group 3: Sunscreen Spray - Convenient for use, especially after sports or when wearing makeup [7][10] - Important to follow the "three sprays, three not sprays" rule to minimize risks [11][12][13] - Disadvantages include shorter protection duration and inhalation risks, particularly for children [7][10]

Group 1 - The core viewpoint emphasizes the importance of sun protection during summer due to increasing UV radiation, which can cause skin damage [1] - Experts categorize sun protection into two types: physical sun protection and the application of sunscreen [2] - Long-wave and medium-wave UV rays from sunlight can lead to skin aging, fine lines, and sunspots, making sun protection crucial, especially for those with sun allergies [4] Group 2 - For sunscreen that has not been opened, it can be used within three years of the production date if there are no signs of separation or unusual texture [6][8] - Opened sunscreen, particularly those with a shaking mechanism, should be shaken well before use, while lotion-type sunscreens should not be used if stored for more than six months [10] - Different demographics and skin types require tailored sun protection methods, with special attention needed for vulnerable groups [10] Group 3 - Special populations, such as the elderly, pregnant women, and those with sensitive skin, should prioritize physical sun protection methods like using umbrellas or hats, and choose less irritating sunscreens [11] - Infants under six months should avoid sunscreen products, relying instead on physical shade, while those over six months can use baby-specific sunscreens moderately [11] - Recommendations for sunscreen include SPF greater than 30 and PA rating of at least two pluses for regular activities, and SPF greater than 50 with PA rating of three pluses for intense sun exposure [13]

Group 1 - The core viewpoint of the articles emphasizes the importance of proper storage and usage of sunscreen products to maintain their effectiveness, countering the myth that opened sunscreen loses its protective ability even within its expiration date [1][2][3] Group 2 - Sunscreen products can be categorized into two types: those containing physical blockers (like zinc oxide and titanium dioxide) which are stable and maintain effectiveness even after opening, and those with chemical blockers (like avobenzone) which are less stable and require careful storage [1] - Proper storage conditions for sunscreen include avoiding direct sunlight and high temperatures, keeping the product dry and sealed, and minimizing transfer to other containers to prevent contamination [2] - Indicators of sunscreen expiration include visible separation, clumping, discoloration, or unusual odors, and a decrease in effectiveness can be tested by observing skin reactions after application [2][3] Group 3 - Effective application of sunscreen requires using an adequate amount, typically the size of a one-yuan coin for facial coverage, and applying it 15 to 30 minutes before sun exposure [2] - Reapplication is recommended every 2 to 3 hours during prolonged sun exposure to ensure continued protection [2] - Sunscreen should also be applied to all exposed skin areas, and physical barriers like hats and umbrellas can enhance protection [3] - It is important to cleanse the skin of sunscreen after sun exposure, using appropriate cleansing products [3]