  We propose a new class of infrared-collinear (IRC) and Sudakov safe
observables with an associated jet grooming technique that removes dynamically
soft and large angle branches. It is based on identifying the hardest branch in
the Cambridge/Aachen re-clustering sequence and discarding prior splittings
that occur at larger angles. This leads to a dynamically generated cut-off on
the phase space of the tagged splitting that is encoded in a Sudakov form
factor. In this exploratory study we focus on the mass and momentum sharing
distributions of the tagged splitting which we analyze analytically to modified
leading logarithmic accuracy and compare to Monte-Carlo simulations.
