What is the difference between Ultralight and Light? 

Ultra-Light has 80 g/m² of eiderdown and suits bedrooms around 22–24°C / 72–75°F. Light has 125 g/m² and suits bedrooms around 20–22°C / 68–72°F. If you sleep warm or keep your bedroom relatively warm, start with Ultra-Light. If you like a little more warmth, choose Light on our Icelandic Eiderdown Duvet.