La Roche-Posay Anthelios UVMune 400 Invisible Fluid SPF50+ is a high-protection sunscreen featuring the innovative Mexoryl 400 filter for ultimate UVA/UVB protection. This non-perfumed formula offers ultra-long UVA protection in a lightweight, invisible fluid texture suitable for sensitive skin. This product comes as a buy-one-get-one-free offer, providing two 50ml bottles of the sunscreen. The formula is specifically designed to protect against the most damaging UV rays with its MEXORYL 400 filtering system. It's water and sweat resistant, non-greasy, and leaves no white marks. The sunscreen should be applied 20 minutes before sun exposure and reapplied every 2 hours or after swimming/sweating for optimal protection.