What separates the Hi-Tech coil from other innerspring futons is the hourglass shape of its Bonnell coil unit, made from 14 gauge steel for strength and support. This unit is then encased in high density foam for a mattress like feel while sleeping, and the seated firmness of a traditional sofa. The estimated daily use lifespan of this futon is 10-12 years, even longer if only used occasionally. Available in all traditional mattress dimensions, as well as chair & loveseat sizes.