This Factor 50+ sun cream has been developed specifically to protect skin from the increased intensity of UVB/UVA at altitude. Ideal for skiing, boarding and high altitude walkers or runners, this unique formula combines advanced solar filtration with added vitamin E and B to protect your skin from long term damage. Apply liberally over dry skin 30 minutes before sun exposure. One application lasts for up to 8 hours, but reapply every 2 hours at high altitude, in areas of increased humidity, after swimming or using a towel. 100ml tube.