Researchers at HRL Laboratories created a woven mesh of hollow nickel tubes, it is considered the least dense material on earth. "Its volume is 99.99 percent air, and its density is 0.9 milligram per cubic centimeter--not including the air in or between its tubes"
It also has the property of rebounding by 98% after being compressed, making it good for absorbing shock
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http://news.cnet.com/8301-30685_3-57327382-264/breakthrough-material-is-barely-more-than-air/
CNET: Breakthrough material is barely more than air
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