How does the iComfort Zip support the spine and back?
It provides even, full-surface support rather than zoned lumbar lift, scoring 6.6/10 for spinal support. Dense foam gives level, neutral contact that suits back and stomach sleepers who want firm support near the surface. Because there is no coil system, a tall all-foam build can let the hips gradually settle more than a sprung core resists. Sleepers needing targeted, springy lumbar reinforcement will get more from a zoned coil hybrid.
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