Basically, they protect the skin from the sun's harmful Ultra-Violet B (UVB) rays. UVB rays are generally considered to be the most dangerous for sunburns, prematurely aging skin, and potential skin cancer.

What is SPF?

All sunscreen lotions carry a Sun Protection Factor (SPF rating). This indicates the level of protection each product provides users from the UVB rays. By using higher-rated products (carrying higher SPF numbers), sunbathers and outdoor enthusiasts can safely remain longer in the sun.

Choosing the right sun block?

There are numerous types of sunscreens, SPF's, and ingredients. Choosing the right one can do a great deal towards keeping you and your skin young and healthy. You want to make sure you find a sunscreen that is good for your skin. Depending on your skin type, and how much sun exposure you are going to have, and your skin care regime helps decide those factors.

The first thing you need to know about sunscreen is what the 'SPF' and the number following it means. SPF means Sun Protection Factor, the number following SPF means the sunscreen will provide you that many times as long as the minutes it would take your skin to redden in the sun without any sun protection.

The second thing to know about using sunscreen is look for a sun protection product that states on the label that it is 'broad spectrum'. While most any sunscreen will protect your skin from burning and ultraviolet rays, only a sun protection product that is 'broad spectrum' will protect you against the deep, penetrating ultraviolet A rays, ( UVA ).

Price does not indicate the effectiveness of the sun protection product. In general, pricier sunscreens have additives that do not help in blocking harmful ultraviolet rays. Look for a sunscreen with proven effective ingredients like titanium and zinc oxide.