Mask fitting demo at Medic Drugstore


Participants of the mask fitting and validating demo

Participants of the mask fitting and validating demo

Due to the recent haze situation in Singapore, we receive many questions from customers regarding how to fit the mask. This is especially important for children because their lungs are not yet fully developed and are more vulnerable. Wearing an ill fitting mask gives a false sense of security; unaware users may expose themselves in unnecessary risks.

Upon customer’s request, we conducted a Mask Fitting Demo session at the Medic Drugstore at Tanjong Pagar Plaza. Medic Drugstore is our retail partner in Singapore since 2009.

First of all, we need to understand why mask fitting is important. The working principle of a mask (negative pressure respirator) is to seal-off mouth and nose such that the only way the polluted air can get into the mask is through the air filters. If the mask is not fitted properly, ambient air can easily bypass the filters and enter breathing zone directly. Henceforth wearing a poorly fitted mask is similar to not wearing a mask. On the other hand, a well fitted mask allows the users to breathe in cleaned air.

Totobobo mask fitting procedure:

1. Pre-test* – To demonstrate poor fit leads to poor respiratory protection.

2. ReShape to improve the fit – This is an iterative process between watermark seal check and reshaping.

3. Final test* – To demonstrate the high protection performance of Totobobo mask when a good seal is achieved.

*A professional respirator fit-test equipment, TSI Portacount Pro+ 8038, was used to validate the protection performance. Portacount Pro is the gold standard in the industry for respirator testing.

Two important features (unique to Totobobo mask) we demonstrated during the Mask-fitting session:  The Watermark Seal Check (WSC) and the ReShape function.

Watermark Seal Check (WSC):


Watermark shows up where the mask touches the face, also where the seal is

Watermark Seal Check (WSC) is a patented feature of Totobobo mask. It allows users to check the seal by means of “Watermark”, easily and accurately. The “Watermark” refers to the area of the mask changes from translucent to transparent when the mask touches wet skin. A continuous watermark loop around nose and mouth indicates a completed seal.

  • First wet face with water, then put on the mask.
  • Check the edge areas of the mask whether a continuous watermark loop appears around nose and mouth.

Tips: Sometimes by adjusting the straps (shorter or longer), making it a little tighter or looser, or moving the mask up or down can shift the watermark and change the seal condition.

adjusting earloop

adjust Totobobo earloop by looping the strap around the filter and in between the two small wings


ReShape the mask

Totobobo mask is made of a special polymer which allows re-shaping when it is heated up by hot water or hair dryer. Most of leakage problems occur below chin and around nose bridge can be solved by ReShaping. Here are two approaches to eliminate the gaps in these areas.

ReShape the bottom of Totobobo mask to fit the chin

ReShape to fit the chin: Press a finger on the fold line against table top, hold it for 10 seconds.

To eliminate gap below chin – A new mask usually doesn’t fit a face perfectly due to a fold-line formed whilst flat packed. The fold line causes a gap below chin. To eliminate this gap:

  • Dip the mask quickly into and out of hot water a few times (70-80°C, NO boiling water which will damage the mask permanently)
  • Press a finger on the fold line against tabletop, hold it for 10 seconds.
  • Release to check if the fold line diminishes. If the fold line is still obvious, the water may not be hot enough. Redo with hotter water. The lower part of the mask should have been widened up.
Moulding the nose area and at the same time open up the Totobobo mask to transform it into a 3D shape

Moulding the nose area and at the same time open up the Totobobo mask to transform it into a 3D shape

To eliminate gaps near nose bridge – With the help of Watermark, take note of the location of the gaps (translucent area) next to nose bridge.

  • Dip the mask quickly into and out of hot water a few times (70-80°C, NO boiling water which will damage the mask permanently)
  • Hold the bottom (chin part) of the mask with one hand, use the other hand to help shape the nose bridge area (use thumb and index finger to press at the points where the gaps are observed).
  • Hold the mask in the new shape for a minute or two to fix the shape.
  • Try the newly shaped mask on user’s face with the WSC method. You may need to do this back and forth a few times in order to eliminate all the gaps. But once you achieve it, the new shape can be retained for subsequent uses.

Below is an overview of the “Mask fitting and validation process” for your reference (Click to enlarge).

Totobobo mask fitting demo process




How to perform a seal check with the “Water Mark” Method?

The protection a Respiratory mask provides solely depends on two factors:

1: How effective the air filter is

2: How well the mask is able to fit to the user’s face, making sure the air you breathe        in is only passed through from the filters.

The filters are test by reputable laboratories and certified reports are produced.

We have sent files to Nelson Labs in USA and the results were published.

However, it isn’t that easy for users to check if the mask is providing a perfect fit on their face, without any gaps. Totobobo Mask, by far, is the only mask on the market which allows this method to be applied, the “Water Mark Check”.


Water mark shows poor and good seal before and after ReShape of Totobobo mask.Water mark shows poor and good seal before and after ReShape of Totobobo mask.


The edge of the Totobobo Mask, which is frosted, turns transparent when it comes into contact with wet skin. This is called the “Water Mark”. The following shows a step by step approach on how to check the sealing of the mask using the water mark.

1 : Apply a thin layer of water on the user’s face with cotton wool, mostly around the nose bridge and the chin areas.

2 : Put on the mask and carefully examine the water marks.

3 : Check if the water mark forms a complete, continuous loop, from the nose all the way through the mouth and under the chin. If the water mark forms a complete loop, it indicates that the mask is providing a good seal and fitment around your face. The mask is then ready for use.

4 : If there are segments of frosted markings that breaks the continuous loop, that means the the mask is not sealed perfectly to the user’s face and has gaps in between. You will have to adjust the mask to improve on the sealing of it.

There are several things you can do to improve the sealing of the Totobobo Mask.

  • Adjusting the position of the mask. (Shifting it up and down)
  • Adjusting the tension of the elastic straps. (Firm but not too tight)
  • ReShape the mask (Using Warm but not boiling water and a hairdryer.)
  • Downsize the mask by trimming it down. 

Your mask is ready for use and provides the best protection only if you have a good seal. Do use the water mark method to have a confirmation on the seal!