  In processes at the energy much higher than electroweak scale, weak boson
mass act as the infrared cutoff in weak boson loops and resulting Sudakov log
corrections can be as large as 10%. Since electroweak theory is off-diagonally
broken gauge theory, its IR structure is quite different from that of QCD. We
briefly review recent developments on electroweak Sudakov and discuss on the
exponentiation of Sudakov double logs and explicit 2 loop calculations in
Feynman gauge.
