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Our study comprises very low mass stars (.0.2푀) and browndwarfs (.0.08푀, i.e.,.80푀Jup) in three star-forming re-gions: the Orion Nebula Cluster (ONC), NGC 1333, and IC 348.Among young (∼1−3Myr) stars and brown dwarfs, mass is closelycorrelated with spectral type and effective temperature (푇eff); thehydrogen-burning limit of∼0.08푀corresponds to a spectral typeof∼M6 and an effective temperature of∼3000K (Luhman et al.2003; Luhman 2012). In the ONC, we rely on membership and푇effestimations from Robberto et al. (2020); in NGC 1333 and IC 348,we rely on membership and spectral type estimates from Luhmanet al. (2016).