Back 2 Nature Surf Zinc is a biodegradable, marine friendly sunblock for your face. The Surf Zinc formula is made with non-nano zinc oxide, which shields your skin from the sun's harmful rays without the use of harsh, unhealthy chemicals. Zinc particles sit on top of the skin and provide a barrier against UV damage, without blocking pores or causing blemishes. All the natural, virgin oils provide a natural SPF and at the same time hydrating the skin whilst exposed to the sun and salty sea air. This is the perfect sunscreen for adventurous water sportsmen who spend long hours in the water. This nourishing, non-greasy sunscreen formula is water-resistant for up to 2 hours and has a high SPF. Apply at least *5min before sun exposure and again every 2 hours, especially after being in the water.