A mattress includes a head section, a seat section and first and second outer leg support sections. The seat section and the first and second outer leg support sections are configured to define a central opening therebetween. The mattress further comprises a removable center leg support section configured for movement between a first use position located within the central opening to provide a portion of the mattress and a second storage position detached from the mattress and located below the mattress. A drip flap is coupled to the seat section and first and second outer leg support sections of the mattress. The drip flap is configured to extend downwardly below a bottom surface of the mattress adjacent the central opening of the mattress. The mattress further includes a relatively rigid element secured to the drip flap to prevent the drip flap from folding upwardly when the removable center leg support section is moved from the storage position below the mattress to the use position within the central opening.