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Technical library · Materials and fabrics · 9 / 12

The wetness indicator: see without disturbing

On the outer face, lines change colour when the core is wet. You know when to change, without opening or waking anyone.

The wetness indicator: see without disturbing

How it works

The indicator is an ink applied hot on the film, between the core and the outside. Moisture-sensitive, it turns from yellow to blue, or fades, as soon as liquid reaches its position. It does not measure a quantity: it signals a presence.

Three lines, readable from the side

On our premium ranges, three lines run along the length of the product and extend onto the side: a person lying on their side, or a carer standing by the bed, sees the colour change without uncovering the person. One glance is enough to decide on a change, day or night with low light.

Using it well

The indicator is a signal, not an instruction. A blue line at the first void does not mean the product is full; all lines coloured, or colour climbing toward the back, means it is time. The person's skin and comfort remain the first references.

Our choice

Three indicator lines on premium ranges, positioned to be read from the side, ink with no skin contact.

Key points
  • It signals the presence of liquid, not a quantity.
  • Three lines visible on the side: no need to uncover the person.
  • One signal among others: skin first.

These pages describe materials and test methods in general terms. The exact characteristics of each product are on its technical sheet; they evolve with our laboratory work.