Ultra-soft knit fabric with a smooth exterior & a plush interior for just the right amount of warmth. Material wicks sweat & dries really fast. ArmourVent mesh panels for added breathability where you need it most. Ergonomic flatlock seams deliver a comfortable, chafe-free fit. Dropped, shaped hem for enhanced coverage. Built-in interior thumbholes are more comfortable, keep sleeves secure & help seal in your body heat. Back RUN graphic & reflective details for low-light runs.