1. A spring mattress comprising a plurality of interconnected coil springs enclosed in casings, the springs having a first and a second end, wherein for at least one of the springs, casing portions arranged at the first and second ends of the spring comprise openings through the spring, and pieces of foam material arranged in said openings, so that a first portion of each piece of foam material extends towards the first end of the spring and a second portion of each piece of foam material extends towards the second end of the spring, wherein at least one of said first and second portions of the pieces of foam material extends past the first and second end of the spring, respectively.
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