A set of data to tell you, the original waist like the hardness of the spring mattress

Waist is bad, probably all heard the phrase: 'sleep sleep hard bed'. Some people directly to remove the spring mattress, spread a thin layer of sheets on the bed board, think that I can relieve pain. Sleep hard bed can save your waist? Tell you life you invited experts, the waist like what kind of mattress. Waist is bad, probably all heard the phrase: 'sleep sleep hard bed'. Some people directly to remove the spring mattress, spread a thin layer of sheets on the bed board, think that I can relieve pain. Sleep hard bed can save your waist? Tell you life you invited experts, the waist like what kind of mattress. Waist is bad, probably all heard the phrase: 'sleep sleep hard bed'. Some people directly to remove the spring mattress, spread a thin layer of sheets on the bed board, think that I can relieve pain. Sleep hard bed can save your waist? Tell you life you invited experts, the waist like what kind of mattress. Waist is bad, probably all heard the phrase: 'sleep sleep hard bed'. Some people directly to remove the spring mattress, spread a thin layer of sheets on the bed board, think that I can relieve pain. Sleep hard bed can save your waist? Tell you life you invited experts, the waist like what kind of mattress. ​