Medium-weight insulation for perfect balance between warmth and performance (60gsm body, 40gsm sleeves and hood). Insulation This jacket comes with two insulation choices depending on your riding style. The 'Insulated' option comes with a versatile 60/40g insulation split for an excellent warmth to weight ratio, while our 'Lined Shell' option is insulation-free to keep you light on your feet, and the layering power in your hands. worn once