Ultralite 150 is our lightest Superfine weight, ideal for warm to hot conditions. Wear solo in the heat, and layer with other Icebreaker garments in cooler conditions.                                                                                                          Lite 200 is a lightweight travel layer, ideal for cool to warm conditions. Wear solo in the heat, and layer with other Icebreaker garments on cooler days or when the temperature drops at night.