Only this mechanism can hold very thick seat cushion and thick mattress. 

Very Thick Cushion is zipped to mechanism for users' convenience. 

Operation for everyday,optional for metal grid.

195cm extra long in open and TV headrest for reading and watching TV.Timber Frame interchangeable with most of 2-steps sofa sleeper mechanisms.

Designer for back staying contempary sleeper style.

Mattress thickness 6 ", typicallly designed for high end sofabed furniture.

Same container loading capacity with or without mattress. 

Only this mechanism can take very thick seat cushion for seat comfort,therefore this is very good for North America market.