U.S. federal regulations have strict limit of the level of damages a mattress could sustain during a 30-minute open flame test.  The peak rate of heat release value cannot exceed 200KW during the 30-minute test, and total heat release value during the first 10 minutes of the test cannot exceed 15 MJ.  TENLLiS A+ grade mattress products passed the US 16CFR1633 test, so they guarantee you not just a good night’s sleep but also the perfect safety.