My sister Teri is running her first marathon in Florence, Italy, this November, and the Adidas Twin Strike shoes I bought her for a semi-marathon four months ago have already had their day. She has flat feet, a low arch, and needs support plus extra cushioning on her forefoot. This is vital here, and I have been doing research for her because she has little knowledge of computers and the world of online resources. Help! Tina Languedoc-Roussillon, France

Welcome to the sneaker showdown of the 21st century. This year, industry behemoths Nike and Adidas unveiled revolutionary new designs—at diametric ends of the spectrum. It’s as if the Book of Genesis and The Origin of Species had hit stands simultaneously. ยป The high-tech ADIDAS 1, due out in December,…

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Yes, as an overpronate runner weighing in at 210 pounds, I probably should take up a less impact-prone sport. But I'm still running, so I need some shoes with torsional stability and impact-absorbing capability. For the past year, I have been running in a pair of Brooks Beasts, which have worked pretty well, but not perfectly (Spenco insoles helped some). Can you recommend several running shoes that are suited for a runner of my build? Charles New York City

I'm hiking the Grand Canyon rim to rim this spring, and I'm wondering what footwear to use. I like the lightness and cushioning of the trail runners that I've been using for my ten-mile training hikes, but I'm wondering if I need something a little more burly for my unsteady legs over the course of the 24-mile hike. Any thoughts on the Lowa Tempest? Jay Phoenix, Arizona

As a frequent trail runner, I looking for a backpack designed with running in mind. I would like something with ple storage for additional layers and supplies, certainly larger than a lumbar pack. Any suggestions? Connor Ann Arbor, Michigan

Dear Gear Guy, can I extend the life of running shoes by using Dr. Scholl's gel insoles? Will they improve the comfort of hiking boots? By the way, I use orthotics. Gary Goins Denver, CO

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To sort through this season's trail-runner bounty, mix equal parts rugged design and motivational psychology