I can't speak for all the FJA's, but I did not get one. It was on my list of would like to haves, but I got socks and a sweater vest instead. Truthfully, though, I find most base layers don't keep my arms warm enough, so I tend to wear a shirt, a merino wool sweater, and a jacket. I'll add a sweater vest over the shirt and under the sweater or a sweatshirt over the sweater if the weather is cooler, or windier. Stay nice and snug that way, just like in Rhode Island.