So my wonderful wife gave me a US Wings Indy jacket for Christmas

(see this thread for background
http://www.indygear.com/forum/viewtopic.php?t=6029). Yes, she kicks a**

. She initially ordered the VIP, but it was out of stock so she changed to the Vintage Cowhide. Although I really like the Vintage look, I opted to return it and wait for the VIP. I can't wait to get it!!!
Here is my real surprise though. Granted this is my first leather jacket of any kind, but all of the US Wings jackets come with a thinsulate lining.

Probably not hard to believe, but I'm surprized that this is never mentioned anywhere (i.e., this forum, the US Wings description, etc.).
Is this just a given for all leather jackets? I guess from all of the discussions about how warm this or that kind of leather is, I assumed that the lining was just plain silk or cotton or acetate or whatever. As always, never assume anything!
Are the Wested's lined with thinsulate also?
