Using these Zoggs swimming goggles is easy. First, adjust the quick - adjust strap to fit your child's head comfortably. Make sure the soft silicone seals are in contact with the skin around the eyes to prevent water from getting in. Before using in the pool, you can rinse the goggles with water to activate the anti - fog technology. When your child is done swimming, rinse the goggles thoroughly with clean water to remove chlorine or salt. Store them in a dry and cool place, away from direct sunlight to protect the UV - protection feature and the lenses. Remember, these goggles are for kids aged 3 and up, so make sure to supervise your child while they are using them.