SR4 pg. 315 "Thanks to monofilament ballistic fabrics, spiderweave threads, ceramic-titanium composite plates, and liquid armor packs to cover non-rigid areas, modern armor is
light-weight, flexible, and concealable."
SR4 pg. 316 "Urban Explorer Jumpsuit: Ideal for messengers, athletes, and anyone on-the-go, these colorful jumpsuits are
well ventilated for lots of action but surprisingly protective with light-weight deniplast and liquid reactive armor."
Out of the armor listed, one is stated to be well ventilated (and with pretty good protection).
Here is the best part though, if you are running a SR game, your armor can be whatever you want. I am just giving my take on armor.

The Ares Globetrotter line is said to be the same.