| 摘要 |
PROBLEM TO BE SOLVED: To provide four kinds of comfortableness according to seasons or preference of a user despite of a single mattress. SOLUTION: In the inside hollow part of a bag body formed by stacking a frontal fabric 2 and a lining 3 together, which are visually distinguishable as the front and the lining, and by sewing the top end side and the bottom end side in its surrounding by different color decorative trimming tapes 91, 92, a summer cotton material layer 7 at least rich in hygroscopicity and heat insulating performance is added to the frontal fabric 2 side, a rather thick winter cotton material layer 8 at least rich in heat retaining property and elasticity is added to the lining 3 side, and a thick core material layer part which is so combined as setting the top end side and the bottom end side to a body pressure absorbing heat insulating core material 4 and a weak air permeability rigid elastic core material 5, respectively, is sealed between the both cotton material layers 7, 8.
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