When applied properly, an SPF 15 filters out 93 percent of UVB, SPF 30 filters 97 percent and SPF 50 filters 98 percent. SPF 15 is good enough. According to The Skin Cancer Foundation, most sunscreens with an SPF of 15 or higher do an excellent job of protecting against UVB.PF10-15 is good enough for me as my skin is allergic to higher SPF for you need to add chemicals onto the product in order to achieve a higher SPF.
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Best Answer: A buck-slip is also a small piece of paper that is sometimes preprinted, or hand-written, and included the names of the people who were to receive a memo or report. It is a routing list. In the days before copy machines and computers people typed one memo, with a carbon copy, then passed the one copy of the memo around to the people listed on the buck slip. Each person initialed next to their name on the buck slip and passed the memo on to the next person on the buck slip. A tactic used to delay or delegate something was to pass the document on to the next person, without initialing the buck slip -- pass the buck (slip).