The filament is made from nylon. This means it can take up atmospheric moisture which directly affects the modulus of elasticity. The paper written by Young & Booth in 2000 actually guarantees Bailey’s monofilaments for clinical use.

If the patient is unable to feel the 10 gram monofilament against their skin, they are deemed to have lost their protective sensation and are “at risk” from foot ulceration. The patient may then be referred on for specialist treatment/education.