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.