Piz Buin 1 Day Long Sun Protection Satchet is one application which gives 10 hour sun protection. SPF 15 - High Protection. Highly effective UVA/UVB filters. Extra water resistant formula provides all day hydration and allows gradual tanning. Non-greasy. Instructions: Apply correct amount evenly (1 satchet to be used if wearing T-shirt and Shorts, 2 satchets if wearing swimwear), 20 minutes before sun exposure. Make sure all areas are covered. Once outside: After swimming rinse off sea salt/sand without rubbing. If you feel the need then reapply in sensitive areas. As with all suncare products , protection levels vary according to skin sun sensitivity. Avoid strong midday sun.