The Sportful Men's SottoZero Long Sleeve Base Layer turns cold, miserable riding conditions into a pleasant affair with its high levels of insulation and breathability. Toss this lightweight base layer under your favorite jersey for enhanced thermo regulation on freezing cold winter excursions and drizzly shoulder season rides. Warm, wicking wool throughout traps precious body heat, while wicking perspiration off your skin for a pleasantly dry feel. DryPro fabric strategically placed along the underarms and back hem provides excellent moisture wicking performance where you sweat most. Plus, this fabric is highly stretchable for extra mobility when you're dropped in the riding position.