Using mosquito repellent lotion means: you dont have saw the air to kill this little things, you can have apicnic with your family in the open air without bringing a Mosquito Net. Their effective factor in them is IR3535, which is developed by Geman company Merck and has been used by Geman Army, It is more safe and effective than DEET, which is mostly used by other related products, such as Johnson & Johnson.