Trying to figure out how skin actually reaps the benefits of a dry sheet mask? The moisturizing formula in dry sheet masks is softened and released onto skin via the wearer's body heat and/or by massaging the mask while it is worn, says Chao. Once the formula is deposited onto skin, it acts like any facial moisturizer. The emollient-rich formula will smooth the surface of skin by filling in gaps of the skin barrier, creating a protective layer against moisture loss.

Nannette de Gaspe Beaubien says that her brand's dry sheet masks — or "infusers" — use Biomimetic Micro Vectors (BMV) transport technology which allows for micro penetration of active ingredients through multiple layers of the dermis. Without getting too science-y, the active-rich BMV has a balm-like texture which is imprinted on the brand's techstile infusers. When the infuser is applied, temperature, pH and/or natural body movements activate it. The BMV technology has components similar to skin's composition so when they come in contact with each other, the two seamlessly merge. Beaubien points out that instead of just filling the lipids, the high concentration of actives in the formula repairs cells.

Image via Miss de Gaspe

Application

Dry sheet masks are applied in a similar manner as traditional wet versions. After cleansing and toning, apply the mask to your face. The Nannette de Gaspe, Miss de Gaspe and Charlotte Tilbury masks all have ear straps for a secure fit. Like most other sheet masks, they're meant to be left on for about 15 minutes. The difference is, most dry sheet mask instructions encourage you to massage the mask while wearing it for maximum absorption.

Reusing dry sheet masks

Dry sheet masks can actually be reused without compromising hygiene. For instance, the Charlotte Tilbury dry mask instructions state that it can be worn three times. Similarly, the Nannette de Gaspe products are reusable for about three to five applications, depending on the condition of skin. Beaubien explains that after each application, users just have to ensure they keep the infuser dry and seal it up in the hygienic pouch to prevent it from drying out.

Image via Miss de Gaspe

Though Beaubien says that Nannette de Gaspe masks are suitable for all skin types, Chao cautions that some dry sheet mask formulas might not be ideal for everyone. She warns that the heavier formulas might be problematic for those with oily or blemish-prone skin. What's more, some users have stated dry sheet masks can leave behind an oily residue, which feels unpleasant on oily skin.

Those with dehydrated skin might find that dry sheet mask formulas lack the humectant-rich, watery moisturizer they need. Those with sensitive skin should also be careful as some dry mask reviewers have complained about redness and irritation.

Image via @missdegaspe

Being able to hygienically reuse the masks is one big positive. Another good thing about the dry formula is that there's less mess. This makes dry sheet masks great for traveling.

In the case of the Nannette de Gaspe range, Beaubien says their infusers behave more like serums so they deliver more actives deeper into the layers of the skin, creating longer-lasting results and a difference in skin over time. The key is the formula. The infusers are crafted out of 87 percent active ingredients. In contrast, Beaubien says traditional sheet masks are about 85 percent water and glycerin, and just 5 to 7 percent active ingredients.

Image via Nannette de Gaspe

Aside from the irritation concerns we mentioned, some reviewers complained that they didn't notice any change in their skin post-treatment. Another negative is the price. Even factoring the cost per use, dry sheet masks are more expensive compared to traditional masks. The Miss de Gaspe masks clock in at $32 each while the Charlotte Tilbury dry sheet mask costs $27. The Nannette de Gaspe masks start at $75 and go up to $360 for a set.

Fans of traditional saturated sheet masks may have a hard time adjusting to the sensation of a dry sheet mask. Some reviewers describe it as uncomfortable or unpleasant and report issues of the mask not adhering to the face properly.

Image via Miss de Gaspe