How often do I need to use Dermal Science UV Protectant?
No protection is lost when the clothing is washed. There is some loss in protection when the clothing is exposed to sunlight. The equivalent of 24 hours of direct sun caused the loss of approximately 10% of the UPF. For a person engaged in outdoor activities this exposure would require wearing the garment many times. For best protection, retreat after each 10 times the item is worn. If you lose count of the number of times each garment has been worn, just re-treat your clothing at the beginning of each season with the possible exception of winter (depending on your proximity to the tropical latitudes).
