To create the completely seamless heel cup in the Under Armour Speedform, designers headed to an unlikely place: a bra factory. Intimate-apparel makers are very aware that a close fit is key to comfort, and it's those manufacturing techniques that allow this running shoe to be stitch free from heel to toe, every section ultrasonically welded together for a snugger fit. [$120; underarmour.com]
The 2014 Adventure Issue
From Iceland's Highway 1 to Utah's Canyonlands, an epic itinerary for modern explorers.
Plus: Building a Bigger Action Hero
ON NEWSSTANDS NOW
Duke Lacrosse and the Fog of Scandal
How Thailand's Most Notorious Prison Became a Fight Club
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