The UVMune 400 revolution

At L'Oréal, we believe that science is the best way to care for skin health. With over 80 years of expertise in suncare, we have consistently sought to push the boundaries of solar protection. For the last 30 years, our Research & Innovation teams have been dedicated to understanding the complexities of the sun to help protect skin types everywhere. 

Decoding the spectrum and protecting your solar capital  

Sunlight is not uniform, and skin damage does not take a day off.  

While UVB rays represent just 5% of UV radiation and are the primary cause of immediate sunburn, UVA rays account for 95% of all radiation reaching the Earth's surface. Even behind a window or on a cloudy day, your skin is exposed to these silent, invisible UV rays, 365 days a year.  

And within that spectrum, ultra-long UVA rays, with a wavelength of 380–400 nm, account for 30% of UV radiation hitting the skin, and historically were the most challenging range of all to filter effectively. 

UVMune 400: The new frontier in skin protection 

In order to address this critical gap in sun protection, our scientists achieved a world-first: the development of Mexoryl 400, the breakthrough filter at the heart of our UVMune 400 technology. 

More than a filter, it acts as a cellular shield. Its formula’s robustness is backed by numerous studies, 25 patents and 6 major scientific publications. By precisely targeting the rays responsible for deep cellular damage, UVMune 400 helps prevent up to 80% of the visible signs of premature ageing, including pigmentation and loss of elasticity. 

The art of formulation: our Netlock technology 

We believe that high-performance protection should be comfortable for everyone. A breakthrough filter is only as effective as its ability to deposit and remain on the skin - evenly, comfortably and reliably.  

To transform our advanced filters into a wearable shield, we developed our proprietary Netlock technology. This new formulation approach encapsulates the sun filters in ultra-fine droplets, forming a micro-thin, homogeneous and extraordinarily resilient film upon application. 

The result is protection that is as wearable as it is effective: 

• Invisible & Ultra-Light: No white marks, just a natural finish 

• Built for Daily Use: Non-greasy and designed to integrate seamlessly into everyday routines 

• Life-Proof: Highly resistant to water, sweat and sand. 

At L'Oréal, we believe that science is the best way to care for skin health. With over 80 years of expertise in suncare, we have consistently sought to push the boundaries of solar protection. For the last 30 years, our Research & Innovation teams have been dedicated to understanding the complexities of the sun to help protect skin types everywhere. 

Decoding the spectrum and protecting your solar capital  

Sunlight is not uniform, and skin damage does not take a day off.  

While UVB rays represent just 5% of UV radiation and are the primary cause of immediate sunburn, UVA rays account for 95% of all radiation reaching the Earth's surface. Even behind a window or on a cloudy day, your skin is exposed to these silent, invisible UV rays, 365 days a year.  

And within that spectrum, ultra-long UVA rays, with a wavelength of 380–400 nm, account for 30% of UV radiation hitting the skin, and historically were the most challenging range of all to filter effectively. 

UVMune 400: The new frontier in skin protection 

In order to address this critical gap in sun protection, our scientists achieved a world-first: the development of Mexoryl 400, the breakthrough filter at the heart of our UVMune 400 technology. 

More than a filter, it acts as a cellular shield. Its formula’s robustness is backed by numerous studies, 25 patents and 6 major scientific publications. By precisely targeting the rays responsible for deep cellular damage, UVMune 400 helps prevent up to 80% of the visible signs of premature ageing, including pigmentation and loss of elasticity. 

The art of formulation: our Netlock technology 

We believe that high-performance protection should be comfortable for everyone. A breakthrough filter is only as effective as its ability to deposit and remain on the skin - evenly, comfortably and reliably.  

To transform our advanced filters into a wearable shield, we developed our proprietary Netlock technology. This new formulation approach encapsulates the sun filters in ultra-fine droplets, forming a micro-thin, homogeneous and extraordinarily resilient film upon application. 

The result is protection that is as wearable as it is effective: 

• Invisible & Ultra-Light: No white marks, just a natural finish 

• Built for Daily Use: Non-greasy and designed to integrate seamlessly into everyday routines 

• Life-Proof: Highly resistant to water, sweat and sand. 

Safe by design 

Our commitment to efficacy is inseparable from our commitment to ethics. Every filter we use undergoes rigorous, multi-phase evaluations by independent experts to meet high safety standards at every stage of development. 

And, for over two decades, our environmental scientists have worked alongside institutions like the Monaco Scientific Centre and IFREMER. Together, we seek to ensure that our sun protection technologies are developed not just to protect your skin, but to exist in harmony with the aquatic biodiversity that sustains our planet.