As a dermatologist, I am often asked about the best ways to protect our skin from the sun's harmful rays. While we all know that sunscreen is a must, many people are unaware of the importance of using water resistant SPF products when swimming or sweating. These specialized sunscreens are designed to stay on our skin even when exposed to water or sweat, providing us with long-lasting protection.
What Makes a Sunscreen Water Resistant?
Before we dive into the common ingredients found in water resistant SPF products, it's important to understand what makes a sunscreen water resistant. According to the American Academy of Dermatology, a sunscreen can only be labeled as water resistant if it maintains its SPF level after 40 minutes of water exposure.If it maintains its SPF level after 80 minutes of water exposure, it can be labeled as very water resistant. So, what ingredients are responsible for making a sunscreen water resistant? Let's take a closer look.
Zinc Oxide and Titanium Dioxide
These two ingredients are commonly found in physical sunscreens, which work by creating a barrier on the skin to reflect and scatter UV rays. Zinc oxide and titanium dioxide are both naturally water resistant, making them ideal for use in water resistant SPF products. They also provide broad-spectrum protection against both UVA and UVB rays.Octocrylene
This chemical ingredient is often used in combination with other UV filters to enhance their water resistance. Octocrylene is also known for its ability to absorb UVB rays, making it an effective ingredient in protecting against sunburn.Avobenzone
Another chemical ingredient commonly found in water resistant SPF products is avobenzone.This ingredient is known for its ability to absorb UVA rays, which are responsible for causing premature aging and skin damage. However, avobenzone can break down when exposed to sunlight, so it is often combined with other ingredients to stabilize it.
Dimethicone
Dimethicone is a silicone-based ingredient that is often used in water resistant SPF products for its ability to create a protective barrier on the skin. This barrier helps to keep the sunscreen in place, even when exposed to water or sweat. It also has moisturizing properties, making it a popular choice for those with dry or sensitive skin.Other Important Ingredients
In addition to the above ingredients, there are a few other key players that you may find in water resistant SPF products:- Glycerin: This humectant helps to attract and retain moisture in the skin, keeping it hydrated.
- Vitamin E: This antioxidant helps to protect the skin from free radical damage caused by UV rays.
- Aloe Vera: This natural ingredient has soothing and anti-inflammatory properties, making it a great addition to sunscreens for those with sensitive skin.
The Importance of Reapplication
While water resistant SPF products are designed to stay on the skin longer, it's important to note that they are not completely waterproof.This means that they will eventually wear off, especially after extended periods of time in the water or excessive sweating. That's why it's crucial to reapply your sunscreen every two hours, or more frequently if you are swimming or sweating heavily. It's also important to remember that water resistant SPF products are not a substitute for proper sun protection measures. It's still important to seek shade, wear protective clothing, and limit your time in the sun, especially during peak hours.
In Conclusion
Water resistant SPF products are a great option for those who enjoy spending time in the water or participating in outdoor activities. The key ingredients found in these sunscreens work together to provide long-lasting protection against both UVA and UVB rays.Just remember to reapply regularly and practice other sun safety measures for optimal protection.
