Gee, you have asked me a good question. Here is what the directions say for the slippers..
Materials: For women's size: Double knitting (DK) pure new wool, 1 3/4 oz balls.
Just by reading that I still can't tell if its the yarn or the method. What do you think? The slippers do not look thick. Looks more like a worsted weight yarn to me..but I really can't tell.
The book is Knit handmade style by Janine Flew. There are beautiful blue and white slippers in this book and thats the reason why I recently purchased tthe book.
If you see the link below and click on the picture of the book they even show the pretty slippers there in blue and white.
http://www.knitpicks.com/books/itemi...books_display#
Thanks again for any clarification you can give me.