Patent ID: 7790256

Claim:
A composite tube formed by covering an outer surface of a tube with a foam, characterized in that: the foam is formed of layers composed of bar-shaped foams; and in a section perpendicular to a longitudinal direction of the foam, each of 40% or more of the bar-shaped foams is formed as a substantially fan-shaped figure formed by long and short arc portions of two large and small concentric circles, respectively, and two linear portions extending radially toward an outer periphery from the center of the concentric circles, with the figure satisfying the condition of the following formula (1): [Mathematical Formula 1] 0.5< a/b< 2.5 Formula (1) where a is a length corresponding to ½ of the sum of the length of the long arc portion and the length of the short arc portion of the substantially fan-shaped figure, and b is the length of each of the linear portions of the substantially fan-shaped figure.