Smartwool Men's Classic Thermal Merino Base Layer Crew Size:L the Challenger 7 GTX has

the Challenger 7 GTX has been completely reimagined from the ground up

The Endorphin Speed 5 is built to go fast and feel smooth—whether you're pushing the pace on track night with friends or you're chasing a PR

turns up the tempo even more

Let the low drop and rocker shape geometry lead to an efficient toe-off

Smartwool Men's Classic Thermal Merino Base Layer Crew Size:L the Challenger 7 GTX hasSmartwool Running Shirts Ann Arbor Running Company Color: Black SKU: SW016349G75 Meet the better than ever Men's Classic Thermal Merino Base Layer Crew. We've updated this 100% Merino wool fan favorite with new colors and a new fit to improve functionality while enhancing aesthetics. Shoulder panels eliminate top shoulder seams, and a flatlock seam construction helps prevent chafing. Add one of our best base layers for cold weather to your winter