This sale has been going on for a while now and there have been a ton of sizing issues because Helium has different model vests and a large in one model might be a medium in others and even a small. I wear a large Ronix and Jet Pilot but yet I can fit in a medium and a small Helium. I did score a couple on this sale but they were female vests. There's a long post about this sale in the other forum