This is one purchase that I wasn't sure how they would turn out.. but to my surprise these worked very well! Like the description says, these tanning nipple covers protect sensitive skin to 70% of UV rays! I have had them for two weeks and haven't gone tanning without them! They are a perfect fit for me personally, and I'm sure they will be a perfect fit for many others also! They are very simple to use. Just pull off the smooth release film and place sticky side down on clean skin, then I recommend following with your lotion after. Easy to clean with a mild soap and left out to dry over night. Place the release film back on to the sticky side of the silicone and ready for the next use!