The IKEA Sultan Hasselback is a spring mattress designed to distribute body weight evenly over the entire mattress. Incorporating active pocket springs, this mattress works by following the body's movement to ensure an optimal level of support. It features an extra layer of filling and comes with high resilience foam above the mattress for added support. Accredited by Canadian Physiotherapy Association, it is recognized for providing active support for the lower back. This 4FT6 double sized mattress measures 190 cm in length and 135 cm in width.