I have been using this sunblock from Backcountry Laboratories for several years. Just used it in the Bahamas for a week...And I did not get burned. I'm fair skinned, and normally would burn very easily, but I applied it before we went out for the day, and re-applied in the boat once most days. It's not very greasy, either. Normally we stock it in the 4 oz. size, but will be also offering it in a 2 oz. bottle to help meet current TSA liquid container regulations for carry- on items. Great Stuff! Available in the shop all year.