UVA is also closely associated with premature skin sagging and aging. Exposure to either UVA or UVB radiation can cause skin cancer. UVB radiation damages the outer layer of your skin and causes sunburn, but UVA damages the deeper layers of your skin, and is the primary cause of skin tanning. All three forms of UV radiation are extremely harmful to human skin, but we only need to worry about the first two, as UVC is blocked by the earth's ozone layer. The sun produces three different kinds of UV rays: UVA, UVB and UVC. You can read all about Japanese sunscreens and why they're so good for you on our Beginner's Guide to Japanese Sunscreens. In addition, Japanese sunscreens are typically packed full of hydrating skincare ingredients like hyaluronic acid, glycerin, collagen and more. They soak into the skin quickly, and leave behind very little residue, so it often feels like you’re not wearing sunscreen at all. That’s why sunscreens in Japan are often much lighter and more watery than sunscreens sold elsewhere. So they can’t feel too oily or be damaging to your skin. They’re worn under makeup and other cosmetics. They’re worn at school, and at the office. Sunscreens in Japan are made to be worn all day. We wear sunscreen when we’re planning to spend extended periods in the sun, so it’s not required to feel or look particularly good on the skin. In the west, sunscreen is typically only applied as-needed. They’re used as part of a person’s daily skincare routine, which means they need to be formulated differently to the sunscreens we’re used to in the west. In Japan, sunscreens are often daily-use products during summer, and for many people year-round.
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