The Ideal Pillow Measurement System turns one shoulder measurement into your GS11 level, the only pillow with six adjustable heights. It takes under a minute.
Stand or sit upright and relax the shoulders. Use a ruler or a tape measure held flat, on one side of the body. Someone else measuring you is easiest, but a mirror works.
Below 12 cm, use level 1. Above 18 cm, use level 6.
Every GS11 ships with two bases and two extension layers, labeled 1, 2 and E. Your level tells you which base to use and how many extensions to add under it.
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