The AStars Nucleon KR-3 is actually the back protector I was considering if you guys recommended more of a hard protector, as it seems like a combination of both hard and soft. But I think I'm just going to stick with my Forcefield protectors since you say they'll be fine for the track. The thing I like about Forcefield is they provide you with the numbers, whereas most other manufacturers don't, at least none that I can find. Without getting too technical, the Pro Sub 4 transmits only 3.38KN of force to the rider, whereas another protector might transmit the maximum of 9KNs. Both protectors are considered CE2 certified protectors, but in this case the Pro Sub4 offers A LOT more protection! Without more manufacturers offering these numbers, it's really hard to compare. Thanks for the advice guys!