Effectiveness of two water-resistant sun-creams plummet after worn in water - Test

The protection offered by two popular sunscreens has been found to plummet in testing conditions replicating swimming pools and the sea, a consumer group has warned.

Which? tested water resistance claims made by two sunscreens - one own-brand and one well-known branded product - and found the sun protection factor (SPF) fell by up to 59% after 40 minutes in salt water.