Baronet (Firm). Natural fibres of lambs wool and cotton fill this pocket sprung mattress; wool acts as an insulator while cotton has absorbent properties. 1200 pocket springs are double tempered for extra long-lasting strength, this is a Hypnos specific process which takes a great deal of time and effort. Available with either a regular or firm tension, depending on your orthopaedic needs. And buy this Baronet (Firm) Was £659.00 Now £599.00.