There's many types of UV however and I wouldn't put any faith in claims by windscreen manufacturers as they are talking about UV in general and a lot of your sun exposure also comes from the side windows (especially the arms).
Ordinary glass will block some UV-A and nearly all UV-B.
UV-A (long wave): Most likely to causes cancer and aging of the skin.
UV-B (medium wave): Most sunburn and some cancer.
UV-C (short wave): The ozone layer takes care of this.
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