Zoggs Otter Goggles are a basic design with smoke lenses suitable for indoor and outdoor swimming! These goggles have an adjustable nose bridge for a customised fit and durable silicone head strap. The lenses feature maximum UV protection against the sun's harmful rays. To test the fit of your new goggles, place them to your face without the strap in place and test the seal the goggle provides. If a split second of suction is provided then you have a strong indication of a good fit. Myth: Tightening the strap will ensure your goggles give a good fit. Fact: The goggle straps sole purpose is to hold the goggle in position, not to provide the seal. Adjustment of the strap may be necessary, however you should avoid the temptation to pull the strap too tight, this will simply create uncomfortable pressure on the delicate eye area.