Thanks, Pika - that seems reasonable.

I had achilles tendonitis 8 years ago and the only time I've ever felt sensitivity in this area was on a recent hike in new boots. The boots are winter hikers, they're relatively soft and feel extremely comfortable...and they seemed to perform great on a recent 3-4 hour hike...I mean, they felt great the entire time and later in that day I had no soreness or tenderness. The hike was rocky, but not hilly. I'm left wondering if it was the boots or the distance (doubled hiking time from most recent hike)...maybe combination of both.