Highgrove Regal Super Kingsize Mattress. The Regal is quality at an affordable price with a 12.5g spring unit it is aimed at those who require that extra support. In replicating a fully sprung mattress the reflex high density foam is comfort guaranteed which is upholstered with a micro quilted fabric giving an outstanding look & feel. Overall the Regal has been designed for those who are looking for firmer support without compromising on comfort.