Topo Athletic Ultrafly Running Shoe – Women's Color:Black/Fuchsia Merino wool construction regulates temperature

Merino wool construction regulates temperature in cold conditions while actively wicking sweat away from skin

High-fill responsible down insulation in an internal baffled construction eliminates cold spots and delivers serious warmth-to-weight performance in sub-zero conditions

Works equally well post-run

so you stay regulated when effort picks up

and rocky singletrack without adding bulk

Topo Athletic Ultrafly Running Shoe – Women's Color:Black/Fuchsia Merino wool construction regulates temperatureBuilt for runners who log serious daily miles without sacrificing comfort, the Ultrafly is our pick for road training that actually fits the way feet are shaped. A 5mm drop midsole delivers balanced cushioning with enough ground feel to keep your stride honest, while the anatomical toe box lets your forefoot spread naturally for better stability over the long haul. 28mm heel 23mm forefoot stack with 5mm drop enough cushion for long runs without