Do parasols provide sufficient UV protection?

The Ökotest Foundation has tested how well these products protect against UV radiation in 2008 umbrellas and beach shells out. The result: From a total of 38 tested Strandmuscheln and umbrellas offered nine merely "inadequate" and four "poor" UV protection. But some sunscreen products also performed well: Ten screens were rated "very good" or "good", three were "satisfactory".

With such glaring differences arises for the consumer in the first place the question of how it detects an umbrella with adequate UV protection and which is responsible for ensuring that a sufficient shield protects against UV radiation.