hydraSense Gentle Mist nasal spray is designed for sensitive noses and first-time users who are experiencing nasal symptoms of allergies (seasonal or year-round) or a cold. It can also be used to hydrate and cleanse dry nasal passages. It is clinically proven to help reduce and relieve nasal cold symptoms and helps relieve nasal congestion, obstruction and secretion and related sinus pressure. hydraSense Gentle Mist is made with 100% natural-sourced undiluted seawater.