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.
Mattress Depth 16 cm
Two Sided Two sleeping sides, turn and rotate frequently.
Source 2 Domestic Flamability Rated Source 2 for Low Hazard, General Domestic use