I'm switching over from boots to trailrunners, and I'm wondering if the sock configuration (liner and smartwool-type sock) remains the same, or if you can get by with just one multipurpose sock with trailrunners. Right now I have Vasque Breeze boots, which I wear with liners and a hiking-weight Smartwool sock...I've never had a blister with this set-up. Now I'm thinking about going over to the Vasque Blur trailrunner, and just an ultralight smartwool hiking sock. Do I need a liner?