Gillian Arblaster discusses the process undertaken by the Walsgrave Hospitals NHS Trust to evaluate dynamic pressure-relieving/reducing mattresses before deciding which type to rent or purchase. The study was undertaken over three years ago and, therefore, the products discussed in this article may have been superceded by newer ones. Structural and educational changes might also have taken place within the companies. John Timmons, a tissue viability nurse specialist at Monklands Hospital, Airdrie, evaluates the process and outcomes of this small study.