If you're mystified by the concept of the 'bio-cellulose' mask, then you are in the right place my friend. A bio-cellulose mask is a sheet mask made of, you guessed it, bio-cellulose - i.e. tiny natural fibres which are biodegradable, toxin free and perhaps most interestingly, have a high capacity for retaining liquid.

A bio-cellulose sheet mask, just like any sheet mask, lives or dies on the serum the mask is soaked in. The bio-cellulose is just a vehicle for that serum. As these masks are generally a lot more expensive than their fabric counterparts, it feels there is a misconception about the bio-cellulose itself being the key benefit. However, as good a delivery method a bio-cellulose mask is, it won't be worth a penny unless the delicious serum it is drenched in is up to scratch.

Bio-cellulose masks lay closer to and mould easier to the skin, increasing your skin's contact with the serum. They also hold on to the serum, making them less drip-prone and allowing that valuable liquid to end up on your skin and not the bathroom floor.

The first I tested out was the 111Skin Bio-cellulose Facial Treatment Mask (£20). A brand developed for post-surgery treatments, this is supposed to be perfect for sensitive skin. It has a light, fruity scent - definitely not overpowering. The mask is nicely saturated with fluid and is a good size, minimal annoying folds and flaps to smooth over.

Bio-cellulose masks generally come between two sheets of a mesh like material to protect them although they are no more delicate than a fabric sheet mask really. The 111Skin mask adheres well to the face and you could definitely move around with it on, unlike most fabric masks that are dripping wet and require you to lay down completely still for 20 minutes.The overall effect was very hydrating and soothing, great for dry or sensitive skin.

I also tried the Skimono Anti-Aging Mask (£14.95) - I really like the packaging here, it feels a lot more cosmetic and less medical. The mask itself is not as drenched in serum as the 111Skin mask and the scent is quite chemical. It adheres well and is very cooling but the scent is really quite unpleasant.

I persevered with the Skimono mask in the name of skincare research and the most striking effect was more of a smoothing and tightening sensation, as you might expect for an anti-aging mask. However, as my skin is so dry, I miss the hydrating effect and I do believe that some products offer both hydration and smoothing.

On the whole, I like the 111Skin mask for my skin type. If you can live with a chemical smell and want a more tightening feel, the Skimono mask might be one to try out. For the price, I wouldn't say that either is a necessity - there are plenty of affordable sheet masks in Boots and Superdrug now - but as a luxury or as part of a beauty box like Latest In Beauty, I think they are well worth a try and are a great technology for getting more of that precious serum on to your skin.