Cyclone 3 Hurdles vertical ratio and more —

vertical ratio and more — to help improve your form

Formerly known as PhD® Outdoor

the multi-purpose girl's Tirra brings crazy comfort to her chosen adventure

Perform with the power and comfort of ZQ-certified Merino wool in our Hike Light Cushion Crew socks—formerly known as PhD® Outdoor

Waterproof Leather: High-quality

Cyclone 3 Hurdles vertical ratio and more —Energize your run through every mile in the lightweight Topo Athletic Cyclone 3 women's road running shoes. They're powered by Pebax Powered midsoles and enhanced traction. Durable and breathable uppers provide a lightweight fit that feels like it disappears around the feet Roomy toe boxes allow your toes to align in their natural position for better balance and comfort Secure midfoot and heel design keep you feeling nimble and agile through every