Medium is the level of support to the body, suitable for all average weighted people. This is not a comfort rating.
Open Coil are Bonnel springs in an hourglass shape, joined creating an open coiled mattress.
Fibre Fillings fillings are 100% polyester, man made, very durable, great recovery.
Hand Tufted buttons evenly over the sleeping surface, keeping the fillings together and adding a tension to the springs.
Two Sided Two sleeping sides, turn and rotate frequently.
Source 2 Domestic Flamability Rated Source 2 for Low Hazard, General Domestic use