| http://www.w3.org/ns/prov#value | - ratio of the volume of the recesses to the total of the volume of the rigid polyurethane foam portion and the volume of the recesses of the impact absorbing member) is 3 to 40%. [0029] When the impact absorbing member has a shape lengthwise in one direction, the recesses are preferably formed in a portion other than both end portions of the impact absorbing member. [0030] The impact absorbing mem
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