It's not just about sunburns. UV rays can also contribute to causing cancer. Here is a list of harmful effects listed by US Environmental Protection Agency:

• Skin cancer (melanoma and nonmelanoma)
• Premature aging and other skin damage
• Cataracts and other eye damage
• Immune system suppression
  Source: https://www.epa.gov/sunsafety/health-effects-uv-radiation

Having a UV-Bodyguard can help hugely to fight these harmful effects. €49 is a great price point for he product IMHO.