SRP or Lfeline brands. I have been told the reason they are not USCG approved is they are not easy to put on in an emergency situation (leg straps?). Another reason I have been told is the cost to certify. What I can tell you is I have been stopped by CG and water partrol (inspections) and when wearing the Lifelines they did not even ask about other jackets. In fact we were complimented on wearing a good jacket. I do not even bother to carry the orange junk anymore.