This 13.5 gauge bonnell sprint unit mattress, this Deluxe Sepi-Orthopadic Mattress provides a 900gsm spring insulater pad and 600gsm polyester filling tohelp you get the best night's sleep. With high quality stitch quilting, and an oyster damask ticking this bed provides the maximum semi orthopaedic comfort level you need. Available in 76cm, 90cm, 120cm, 135cm and 150cm sizes.