Trail running socks - Trail T-Free by Sidas US — Love them! The separate big toe prevents blisters on my big toe. They also have a grippy line that keeps my foot from slipping in my shoe.
Sidas Run Anatomic Crew by Sidas — Love these! Wish I had a million pairs!
Trench Foot Cream by TrenchFootCream — Great for running trails or races when your feet will be wet all day. I did a 50-mile race in Cornwall where my feet were wet from the shuttle to the start line until the finish line - and not one blister!