The Rundown Rain or shine. Street to summit. Like that running buddy who never bails, the Challenger 8 GTX says yes to the road, yes to the trail—and yes to rain, mud and snow. Redesigned with more foam underfoot, an improved fit and reimagined multi-directional lug orientation, it’s both smooth on the pavement and trustworthy on dirt. And its GORE-TEX Invisible Fit waterproof membrane means it doesn’t balk at puddles, either. Guess you’re out of excuses. Best For: Trail Running Features: GORE-TEX Invisible Fit membrane Reflective details 100% rRPET engineered mesh 3D screenprinted toe cap Multi-directional 4mm lugs Heel loop EVA midsole WHAT'S NEW You’ll find a new last with increased drop and improved fit in the forefoot and instep. We’ve also amplified the traction with an updated lug design.