B310 Waterproof Combat SmockThe B310 is a fully waterproof combat smock used by Special Forces & touch military units around the world. We originally designed the B310 for the SAS in the late 80's. There have been a few tweaks over the years, however the fundamentals for a simple and reliable jacket have remained the same. The B310 is one of the greatest garments of the entire industry, many thousands of which have been sold across the world, often imitated but never bettered.