The 35"x75" Seg Max mattress has a fiber core and is our most durable mattress. It is for your most destructive guests. The Seg Max cover is nearly impossible to tear. It has sealed seams to help keep dirt, moisture and bed bugs out of the mattress. The cover can be wiped and disinfected. Comes with an inegrated pillow in the core and has a 5 year warranty against the cover cracking or the seams breaking