We see this phrase "Hybrid" so much in the bed world these days and its come from clever marketing, basically its a type of springs which could be open coil or pocket springs with 1 of many foams on top! but wait a minute haven't we allays had springs with some kind of topping? yes! 15 years ago most company's were experimenting with new things and different layers on top springs, so its not a new concept.
The original Hybrid
The original hybrid was first brought out by Sealy in the uk around 2010, it was there pocket Geltex beds and to this day is the only true hybrid in my eyes as its the only one on the market that you put in place and never turn it over or around ever! it literally wont need that kind of care and is specially designed with lumber zones. the lumber zone have been designed so that a certain sections are softer allowing your hips and shoulders to sink in more while still receiving support to the lighter parts.
For more information follow this link: http://www.sealy.co.uk/beds-mattresses/beds/hybrid/