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.
南方周末：你如何看待当前中国先进制造业的发展情况？。关于这个话题，雷速体育提供了深入分析
Что думаешь? Оцени!，详情可参考体育直播
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