Gamma Electronics BT-SMA-195 SMA RF Weatherproof Boot for LMR195. Gamma’s SMA Weatherproof Boots are the fastest and easiest way to weatherproof RF cables and SMA connections. The boots are placed on a cable before it's terminated, and once the connector is added the boot simply slides up and over the connection to create a watertight seal. Our boots have been designed and tested to match specific connector and cable combinations so we can ensure that are watertight, testing up to IP68 standards. They are made from a highly UV resistant silicone rubber that allows them to withstand the elements, including extreme temperatures.