When the temps dip into the single digits, your legs deserve more than regular pants and flimsy baselayers. The Arc’teryx Proton Pants are the luxurious, insulated mid-layer style pants that your lower body deserves, thanks to the warm, soft, and breathable Octa Loft insulation and Fortius 2.0 softshell fabric. Tailor the fit with the adjustable waist drawcord and feel free to wear them standalone or under your hardshell ski/snowboard pants thanks the water-resistant DWR finish.