Piz Buin 1 Day Long Lasting Sun Lotion SPF 30, 100 ml

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We tested two popular sun creams in chlorinated water (to mimic a swimming pool) and salty water (to emulate the sea). We also added another scenario using fast-moving tap water to see what effect this had. Most of the time, the products weren't as effective in our more realistic conditions as they were in tap water. Professor Brian Diffey, of BAD, says: 'We recommend against relying on any sunscreen product for long periods without reapplication, whether advertised as an extended wear product, or not. Remember, sun cream is just one part of staying safe in the sun and it's also really important to encourage kids (and adults) to: Find out what you need to know about 'once a day' sun creams, water-resistant sun creams, sensitive sun screen and the best kids' sun cream too. Some people worry that using sun cream might prevent them from getting enough vitamin D, but this isn’t the case unless you really overdo it.

Sun cream provides protection from sunlight using UV filters. These are classified into two types: chemical and physical – also known as mineral sun cream.Over the course of a day, he added, 'swimming, drying, sweating, getting dressed and undressed' can cause sun cream to be wiped or washed away. In 2016 Which? put several once-a-day sunscreens to the test, investigating how long they lasted on volunteers in a controlled lab experiment, and found they didn't offer nearly as much protection as claimed. However, there's no agreed definition of 'reef-safe', research is still ongoing as to the impact of these chemicals, and our tests found many mineral suncreams failed to protect as claimed – so take any claims with a pinch of salt. Kids' sun cream

The use of the word durable, she added, aims to communicate its long lasting characteristics without 'promising [a] full day protection guarantee, with no need for reapplication.' So, if you are only applying your sunscreen once a day, you are at risk of spending hours in the sun with little or no protection to those areas of skin that may have been missed.'

If you don’t know your SPFs from your UVAs and UVBs, read on as we shed some light on what to look out for with our handy buying guide below – before listing our favourite sunscreens on the market right now. Eat well, live better and stay healthy - sign up for our free monthly Food & Health newsletter for the latest insights delivered straight to your inbox The British Association of Dermatologists (BAD) says frequent reapplication of sun cream is important, regardless of how long any product claims to give protection for. We award Which? Best Buy status to products that we've independently reviewed that meet all our tough criteria: they must pass independent lab tests for UVA and UVB sun protection, and be easy and pleasant to apply. UVA rays might not cause you to burn, but they do penetrate more deeply into the skin and play a greater role in premature skin ageing.

Sweat-resistance: ‘You also want something highly water and sweat-resistant, meaning it won’t slide off or drip into your eyes during your workout,’ says Austen. Nobody applies sunscreen perfectly uniformly to all exposed skin and it is inevitable that we will miss patches of skin. Bear in mind that running at altitude means you’ll be more exposed to UV rays – up to 10% more for every 300 metres above sea level,’ he adds. ‘Nobody ever regretted wearing sunscreen, but we have all regretted skipping it… Skin damage is long-lasting, difficult (if not impossible) to reverse and yet massively avoidable.’ How often should you apply facial sunscreen?For any product to provide the SPF it claims, you need to apply 2mg per square cm – which means around a teaspoonful of product for your face. And, just as with sun cream, it needs to be reapplied regularly. A spokesperson said: 'Soltan Once products clearly state how they should be used and when to reapply. We are confident in the claims for the Soltan Once range and refute the suggestion that they are misleading. When choosing sun cream for your child, look for a short ingredients list and the terms 'fragrance free' and 'hypoallergenic'. The WHO recommends 35ml of sun cream (seven teaspoons' worth) to cover an adult, so use around a quarter to a half of this depending on the size of your child.

What's more, even if you follow all the rules, it's possible you won't get as much as protection as you expect. This tends to mean that two commonly used chemical UV filters linked to coral bleaching – oxybenzone and octinoxate – aren’t used.Yes, you can - but you’ll also need to reapply frequently, just like you would if you were on the beach staying dry, and immediately after towel drying. This is because, she said, the length of protection can vary depending on a person's activities - including how much they sweat and whether they towel dry, for example. The regular reapplication advocated by most sunscreens protects us against this,’ he says. To apply sun cream properly you should: A spokesperson told us that all of its sun creams are designed for 'longevity' but that it found the use of the word 'durable' more 'appropriate' than once a day. It's common for sun creams to claim to be 'water resistant', but this doesn't mean that they're waterproof.