Tdub recommends Thorlo pads for running any distance.  Go to Thorlo.com to order a free pair-just pay shipping.

Made of a proprietary blend of fibers and padding uniquely designed for runners, Thorlos padding:

• Helps reduce the pain and discomfort associated with sore feet, blisters, calluses, plantar fasciitis
• Wicks more moisture away from the foot, helping to protect against athlete’s foot and other fungal infections
• Provides a healthier, more comfortable foot environment

What’s more, Thorlos maintain their fit, shape and protective function over time, even after repeated washings.