This week, we figured out how to use relays to switch polarities of the Peltier thermoelectrics. We have started to design the relays into our integrated circuit and Arduino. Additionally, we bought polyester material to use to house our components and disallow direct contact of electrical wires onto the user. We began to research and integrate switches and dials into our integrated circuit and Arduino. On our vest, we ripped the remaining seams on the back and began to diagram and construct the integration of the Boa Closure system as pressure therapy on the back and across the sides. Vest measurements were completed in order to finalize heat transfer calculations. Furthermore, we have borrowed a 12V 17Ah lead acid battery from the machine shop for testing and validation of the circuit, until we decide on which lithium ion battery to purchase (if we will go over-budget or not). Lastly, we learned how to use the sewing machine and practice stitching on scrap material. We plan sewing on the required materials and components using ultra-strength Kevlar thread in the near future.