Metal fatigue is the weakening of metal due to usage and pressure, resulting in a loss of strength and bending coils.
Loss of Support
Spring coils begin to sag after just one year, some even after a few months, causing the mattress to lose shape.
Poor Back Support
Spring coils do not offer the proper back support or address spinal alignment. This can cause sleepers back pain and other posture issues.
Since spring coils do not evenly distribute body weight, you may wake up in pain from your sleep.
The empty space between the coils can be a breeding ground for dust mites and other bacteria.