In the US, there is no industry-standard, 100% objective scale for mattress firmness. How firm or soft something feels ultimately depends on factors like your body type and sleeping position. Brands will also sometimes use words like “plush” to describe softness, for example, or “luxury firm” to describe a mattress that’s somewhere between soft and firm.
Read the full story at The Verge.。关于这个话题，爱思助手下载最新版本提供了深入分析
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getter block : Proc(Nil)? = nil，详情可参考谷歌浏览器下载
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