Support Strength index?
Pillows should support the head and allow the neck muscles to relax. Because the optimal firmness of a pillow is decided by individual sleeping habits, we have developed pillows to suit everyone's needs.
Less heavily filled pillows, suited for stomach and back sleepers.
Averagely filled pillows, suited for stomach, back and side sleepers.
Heavily filled pillows, especially suited for side sleepers.
Refillable pillows, adjustable in height, suited for stomach, back and side sleepers.