  A class of grand unified theories with symmetry breaking scale of order
$10^{16} GeV$ have a Higgs particle with mass in the $TeV$ scale. The cosmology
of such theories is very different from usual. We study the cosmic strings
obtained in such theories. These strings are much fatter than usual and their
mass per unit length is reduced, resulting in a significant reduction in their
cosmological effects. We also study the temperature evolution of such models.
