My fasc Austria is 440g/m2. So its a heavyweight champ.. Don't know bout Plenty Soul, since that's not european brand, but fasc is uber nice. Especially crossed, timmy panda, bunny 2 and fresh hoodies.
Riding with base layer and hoodie in -4deg. for 6 hours - warm and toasty. Whenever I slow down, just add extra layer under and it keeps warm. Quality is epic.