In the past years a wealth of observationsallowed to unravel the structural properties of the Dark Matter Halos around spirals. First, their rotation curves followan Universal profile (URC) that can be described in terms of an exponential thin stellar disk and adark halo with aconstant density core, whose relative importance increases with galaxy luminosity. Careful studies of individual objects, from dwarfs to giants, reveal that dark halos have a core, whose size r0 correlates with the central density ρ0.These properties are in serious discrepancy with the cuspy density distribution predicted by N-body simulations in collisionless ΛCDM Cosmology.