100% Natural. Preservative free. Soothes & moisturizes. Relieves congestion. Non-habit forming. Original swiss formula. New larger size Soothe and moisture your sinuses and relieve uncomfortable congestion with Similasan s preservative free Sinus Relief nasal mist. Similasan s preservative free Sinus Relief nasal mist gently stimulates the body s natural ability to relieve sinus congestion and inflammation of the nasal passages while soothing irritating dryness. For over 25 years our Original Swiss Formulas - made with 100% natural.