Supplies wearer with 300 mg of all-natural Vitamin B1 which courses throughout the entire body and is excreted through the pores to repel insects from head-to-toe. Patch utilizes the natural benefits of Vitamin B1 through a thermal based patch that directly supplements the wearer's bloodstream with a steady delivery that ultimately provides complete head-to-toe protection from most biting insects. Safe for use with FR clothing. No mess, sprays or smells. Convenient, total body protection in a single dose application. Up to 48 hours of protection. Made in USA.