This makes it clear, very clear!

My 8yrd 16oz weighs 3.2 pounds and a SWK solid color would be 2.5 pounds as it is only 6yrds in fabric.

So I conclude that it is indeed 13oz wool they use and it's like a 5yrd kilt with a little extra oomph. It would be almost 2/3 a pound lighter (which is well over a Kilo in the eurozone)...that's a lot!

Most 5 yrd casual kilts from Scotland start are about $350, so really they are a bargain.