The yarn is Jo Sharp Silkroad DK Tweed. Because it's a tweed, it knits almost like a worsted.
Here is what WEBS (yarn.com) says about the yarn:
"Silk Road Aran DK Tweed is the lighter member of the Silk Road family features the same soft and warm wool/silk/cashmere blend as its heavier cousins.
Content: 85% Wool/10% Silk/5% Cashmere
Care: Hand Wash
Weight/Yardage: 50 gm/147 yards/ball
Gauge: 5 sts on #6 needle
Knitting Weight: DK"
And here is a link to the page at WEBS:
JO SHARP SILKROAD DK TWEED
Thanks for your kind words and compliments about the hat!
I really do like it myself. It wasn't boring to knit, and it was quick!