Abstract: Top mass is one of the most important Standard Model parameters that is being measured at the LHC. The measurement is currently limited by O(1 GeV) theory uncertainty due to our inability to precisely specify mass scheme for the top mass parameter built in the Monte Carlo simulations used at the LHC. We show how the top mass can be extracted kinematically using cross sections for event shapes observables calculated using effective field theory methods. With the help of Soft Drop grooming to the level that does not disturb the radiation that can modify the top mass definition, while still isolating the top jet, we obtain a distribution that is only mildly sensitive to the underlying event and initial state radiation. The data from LHC for top jets can thus be made to look very similar to e+e- collisions. We derive, for the first time, an effective theory analysis for Soft Drop groomed top jets.