Only UVB and UVA rays ever reach the earth’s surface and therefore your skin.

UV Radiation and the Skin

UVA rays penetrate more deeply into your skin and are primarily responsible for photoaging and tanning, whereas UVB rays don’t penetrate as deeply, have higher energy, and are responsible for sunburns.

UVA versus UVB

An easy way to understand the difference between UVA and UVB is to relate UVA to “light” and UVB to “heat”. Look at the graph above. Notice that UVA is fairly constant throughout daylight hours, whereas UVB gathers intensity with the warmth of the sun, peaking at mid-day, and declines again.

Skin Cancer Is More Prevalent Than All Other Forms of Cancer Combined!

Skin Cancer

Your risk of getting skin cancer is directly tied to your UVA and UVB exposure. Not only are skin cancer rates on the rise, but skin cancer is more prevalent that all other cancers combined!


Basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and melanoma account for more than 99% of all skin cancers. BCC and SCC are related to cumulative, long-term sun exposure, while SCC and melanomas are related to intense sun exposure that typically results in sunburn.


BCC and SCC are by far the most common skin cancers and if diagnosed early are easily treated and rarely become life threatening. Melanomas, however, can be deadly if not diagnosed and treated early, killing an estimated 10,000 people in the U.S. annually. In fact, more than four sunburns at any age more than doubles your risk of getting melanoma.

Up to 90% of age-related changes you see in your skin are caused by UVA radiation.

While UVB rays are absorbed in the epidermis, UVA penetrates deep into the dermis and damages the collagen, elastin and other fibers that give skin its structure and a smooth, youthful appearance. UVA also reduces your skin’s ability to repair itself and eventually will result in wrinkles, dark spots and sagging leathery skin. The best protection against photoaging (aside from staying out of the sun altogether) is to use and reapply a broad-spectrum sunscreen daily. How are you going to know when to reapply? By using SunFly UV Indicator Stamps of course!

Not All Sunscreens Are Created Equal

Did you know your skin is the largest organ in your body and what you put on it can be absorbed?

According to the Environmental Working Group there are 292 brands and over 1,700 sun protection products sold in the U.S. market today. Over 80% of these products contain worrisome ingredients including oxybenzone (a hormone disruptor) and retinyl palmitate (linked to skin cancer).

In fact, each year EWG rates sunscreens and puts out “best” and “worst” lists based upon the safety of their ingredient lists. SunFly Clear Zinc Sunscreens will be on EWG’s best list with their highest safety rating of 1.

Chemical vs Mineral Active Ingredients

The active ingredients in sunscreen absorb UVA and/or UVB radiation.

The most common sunscreens on the market contain chemical active ingredients. These products typically include a combination of these active ingredients: oxybenzone, avobenzone, octisalate, octocrylene, homosalate and octinoxate.

ALL of these chemicals penetrate the skin

and all except avobenzone and octisalate have even been found in mother’s milk! Oxybenzone is probably the worst and acts like an estrogen in your body, can alter sperm production, is associated with endometriosis, and causes skin allergies. Octinoxate and homosalate are also hormone disruptors with octinoxate causing moderate rates of skin allergies and homosalate breaks down into toxic byproducts.

Mineral sunscreen actives, on the other hand, are not absorbed into your skin

don’t break down in the sun, and pose little to no health concerns. Zinc oxide is regarded as the safest and most effective active ingredient offering broad spectrum UVA and UVB protection. Titanium dioxide also offers UVA and UVB protection, but doesn’t protect quite as well as zinc oxide in the UVA range. Zinc oxide has been used safely for decades in diaper creams and titanium dioxide is a regular food additive and is Generally Recognized as Safe (GRAS) by the U.S. Food and Drug Administration.

SunFly Sunscreens’ only active ingredient is zinc oxide and provides the safest and most effective broad-band protection available on the market today.