All Ultrasun products need to be applied to clean, dry skin at least 15-30 minutes before going out in the sun. Use plenty and really let it sink in before going out into direct sunlight. Look out for easy to miss bits (around shoulder straps and your clothing). How you apply sun cream matters. Make sure you do it first thing, that you're indoors and you apply enough. Any application in direct sunlight increases evaporation before it's had a chance to bond with the skin, reducing its power to protect. Ultrasun products are based on a lamellar structure which means the product is absorbed quickly and they bind perfectly to the stratum corneum because they are very similar to the skin's natural membrane lipids. This means the UV filters are protected and work for longer below the skin's surface, leaving no greasy residue. Our long-lasting formulas means one application a day should be sufficient to deliver long lasting, high level protection from both UVA and UVB rays. However, another application may be required after extensive sweating, swimming, towel drying or in extreme temperatures. Please also refer to specific product instructions. It is important to be sun savvy, stay hydrated take shade breaks and avoid the sun during 11am -3pm and keep hydrated.