Helmet supports are available in SFI- and non-SFI-rated materials. As you can guess by now, the SFI-rated version is where we'd put our money. The two main styles of helmet supports are open and closed. The open version is a simple U-shape that slides over the neck from behind, whereas the closed version completely encircles the neck with a hook and loop closure strap. The closed version shown here is what we use. Don't confuse a helmet support with a HANS device. The HANS requires special harnesses, helmet straps, and more to integrate properly. The HANS isn't cheap, but if you are a serious track fanatic, it might be something to put on your wish list.