  In this paper we suggest a possible explanation of the giant temperature peak
in the amplitude of the de Haas-van Alphen oscillations observed at very low
temperatures in insulating SmB$_6$ system. Our theoretical model consists of
two fermions with particle-like dispersion but with different masses, one much
heavier than the other, which hybridize with each other to open up a gap at
their degeneracy point. As a result of the hybridization a heavy-fermion hybrid
appears at the Fermi level. Our results strongly suggest that it is exactly
this heavy-fermion hybrid which results in the giant temperature peak. In
addition we propose a scenario when this hybrid has edge states.
