I agree with chef. The medium weight kilt is ideal for wearing indoors and mine actually swings better than my heavyweight ones. In fact when I first got it and tried it on my wife said "Give us a twirl" which I did and it flew up round my ears ! - in fact I call it "My dancing kilt". It's also plenty warm enough indoors as well. I used to attend a Burns Night in a cosy pub (alas the event isn't held any more) and I've stood there at the bar with sweat running down my legs, and was actually glad I wasn't wearing a heavyweight kilt. However if your going to wear the kilt outdoors in the winter you'll really appreciate the heavyweight version. There is however one other point to consider. I'm very much on the large side and I do find that the heavyweight kilts hang better on me at the front. That said I like both versions in their respective ways.