Apply evenly and generously to all exposed areas 15 minutes before sun exposure to the sun, rubbing in well to allow the product to bind with the skin and form a protective film against UVA and UVB rays So it's not surprising that brands have sought to make life easier for us by developing hard wearing sun creams. Do not exceed exposure to the sun for longer than your skin type allows, taking into account the strength of the sun. 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.' Tips for living well - get our free food and health newsletter for the latest insights, taste tests and advice

The Calypso Once A Day range offers effective, highly water resistant sun care products that provide UVA/UVB protection. 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. Avoid sun exposure between 11am - 3pm. Seek shade and always protect children with a hat, loose clothing and high SPF protection.

A spokesperson added: 'As with all sunscreens, it is important to follow the instructions for application and use; and sunscreen should not be used to intentionally stay longer in the sun. Sunscreen is just one part of a sun safe regime.' Boots

Professor Brian Diffey adds that sun creams generally offer ‘very good’ water resistance these days (though be aware water resistance claims also come with caveats, and the products we tested didn't hold up well to real-life conditions in our 2016 investigation), which is good if you're planning on spending time in the pool or in the sea. But over the course of the day swimming will wash away some of the protection. 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. We made multiple attempts to get in touch with Calypso, but the brand did not respond to any of our questions or send us a comment. Riemann Sweating, swimming, towel drying, or rubbing your skin on an abrasive surface can all impact protection levels and how the sunscreen lasts. All of this means you’ll almost certainly need to apply more than just ‘once a day’, especially if you're out and about.Apply evenly and generously, smooth in gently. We recommend a minimum quantity of 35ml for all over body protection. The British Association of Dermatologists says when using lotions, you should aim to apply at least six full teaspoons to cover the body of an average adult and should apply it at least 15 minutes before heading out in the sun so it can sink in. Calypso Once A Day SPF10/SPF15/SPF20/SPF25/SPF30/SPF50; Protect your skin from harmful sun radiation 10/15/20/25/30/50 times longer than your natural protection.

Important: Read the instructions carefully before use. Apply to clean dry skin, preferably after a shower. Apply evenly and generously 15 minutes before exposure to the sun, which will allow the product to bind with the skin and form a protective film against UVA/UVB rays. When used correctly, one application is sufficient for all day protection. 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. Use in the water - Claims to maintain 'intact' protection levels even after 4 x 20 minute sessions in the water.We agree that the claim “Once a day” can be anticipated in a wrong way by the consumer, and it is one of the reasons why we changed our durability communication from “Once a day” to “Up to 10 hours”. Mineral sunscreens fail Which? SPF and UVA tests - find out what happened when we put pricey mineral formulations to the test in our independent lab Casting incorrect assertions in this manner is misleading and confusing to customers and we are disappointed that Which? has chosen to do this.' Calypso

Reapply sunscreen after swimming, sweating heavily, towel drying, or rubbing your skin in a way that might cause the cream to rub off. And after that, he adds, re-apply at least every two hours - and immediately after swimming, sweating or towel drying.The association estimates most of us only apply half of this amount, which means we're often less protected than we think we are.