When we started designing our face masks, we knew that the material we made them from was just as important as the serum itself. We wanted something hydrating, cooling and environmentally friendly that would act fast and hold plenty of product – and we found bio-cellulose.

You might not be aware of bio-cellulose, so here’s a little bit more about the science behind it all and what makes it perfect for our sheet masks. 

Bio-cellulose: the facts?

Bio-cellulose is a super-thin natural fibre. It’s grown in a lab, where the glucose from organic matter (we use natural coconut extract) is converted into cellulose, which generates the super-absorbent fibres that are woven into each sheet mask.

When we say that bio-cellulose masks fit like a second skin, we mean it literally: bio-cellulose was originally developed for use in artificial skin. That means it’s both exceptionally durable and exceptionally hydrating – one of its medical uses is in treating severe burns.

It helps that bio-cellulose also has incredible cooling properties, too – tests have shown that it reduces skin temperature by up to 5.1 degrees over the course of 30 minutes. This makes our face masks an ideal after-sun treatment – or even just a lovely treat for a hot day.

The perfect fit

We chose to make our masks out of bio-cellulose because it maps to every contour of your face. Bio-cellulose fibres have a diameter of just 37 nanometres. That’s one-thousandth of the diameter of a human hair, and it’s also smaller than the skin grooves, meaning our serum can soak into every nook and cranny of the face.

It also means that unlike a paper mask, it clings well and stays in place, whether you’re lying down and relaxing or answering a few emails at your desk. Plus, you spend less time prodding at those annoying spots around your nose where the mask hasn’t quite settled properly, and you can remove and reposition without tearing it.

Locks in moisture

When applied, bio-cellulose creates a breathable barrier that locks in moisture and serum and protects it from the elements. How much moisture? The tiny fibres in bio-cellulose can hold up to one hundred times their dry weight in liquid. You can even see the difference – after 15-20 minutes, the mask gets visibly thinner as the serum absorbs into your skin.

Clinical tests on Kerello’s mask showed that it can carry three times as much essence as other masks on the market. If that sounds good to you, we have even better news: that essence also contains hydration powerhouse hyaluronic acid, which can hold up to one thousand times its weight in water.

Thanks to those tiny fibres that cling to every skin crease, it’ll act quicker, too – Kerello masks can concentrate the equivalent of two hours’ treatment at a beauty spa into one 15-minute mask application.

Our bio-cellulose mask is paired with a perfect partner: liposome technology. Liposomes are a tiny vehicle for water- and oil-soluble substances, like our mask essence, and thanks to their size and structure they can carry our skin-saving formula directly to the skin’s dermis layer, where they can do the most good.  


Worried about the environment? We are, too. While many paper, hydrogel, cotton and jute masks claim to be biodegradable, they’re often impregnated with chemicals that make them unsuitable for composting – so, in spite of those lofty claims, they still end up in landfill.

Not only is bio-cellulose a natural substance made from organic materials, but it’s also completely biodegradable and compostable thanks to the natural and environmentally friendly ingredients we use. When you enjoy a Kerello face mask, you can relax a little more knowing that you’re doing your bit for the planet as well as your skin.

Now you know a bit more about why we’ve decided to make our masks out of bio-cellulose. We love the feel and effect of this material, and we think you will too.