Fog develops due to several factors: a difference in temperature between the body and the water, humidity levels, etc. Wear due to friction is one of the main causes. If your goggles fog up, dip your lenses in the water and a protective film will reform. After a certain amount of time, it is normal for the performance of the anti-fog coating to be diminished. We provide an anti-fog marker that reactivates an ageing anti-fog treatment and which makes your goggles last longer.

The watertightness of the swimming goggles is dependent on the proper fit of the skirts with the shape of your face. Before purchase, we advise you to do the "suction" test with your goggles without the elastic strap: If the goggles stay on your face by themselves, with slight suction, the product will be watertight during your swim. This also enables you to spot any areas of discomfort or annoyance when the model is on your face. This model is available in sizes S & L(narrow & rounder faces).

These swimming goggles fit the morphology of your face without needing to be over-tightened. Goggles that are too tight can cause discomfort, leave marks and even create water inlet holes. It is not necessary to press against the lenses with your hands, a light suction effect is usually enough for swimming sessions without water inlet holes. The straps should ideally sit 2 to 3 cm above your ears. This position will optimise the grip and comfort of the goggles.

We advise you to: - Rinse your goggles (only if necessary) by dipping them in the water - Avoid water jets directly on the inner face of the lenses - Store the goggles in their case between sessions to avoid damaging the lenses (on the inner face to protect the anti-fog treatment, on the outer face to avoid scratches) - Avoid exposing the goggles to temperatures over 60 °C, - Do not touch or wipe the inside of the lenses

The colour of your goggles should be suited to your swimming location and its lighting. If you swim outdoors or in a pool with harsh lighting, prioritise goggles with smoked lenses to limit the glare. If, however, the pool is quite dark with low lighting, winter evenings for example, use clear lenses. The SPIRIT swimming goggles are available with different lens tints (mirrored, shaded, clear).

Complies with standard QB/T 4734-2023; all Nabaiji swimming goggles protect against harmful UVA and UVB rays when used normally, regardless of the lens tint. Looking directly at the sun is dangerous and can lead to irreversible eye damage.