The Watkins 33085 mosquito repellent non-aerosol spray helps repel insects such as mosquitoes, black flies, deer flies, stable flies, ticks and fleas. The 30% diethyl-meta-toluamide (DEET) formula is ideal for those spending up to six hours outdoors. And its 150 ml size can easily fit in your backpack when you're going on outings in the forest or in the mountains.