Use them when you're out in the sun.................I've worked outside for 30+ yrs, 5 days a week and this is the 3rd time getting stuff cut off in 5 years. 2 Basal cells today, one on the forehead and one on my eyelid brings my count to 5 Basals and 1 Melanoma. Protect yourself and your loved ones when you're out on the water or just out in the sun for hours........................