Vivobarefoot Primus Trail Flow Womens mens This is the gel —

This is the gel — with caffeine

Fits all phones

which tells you how much you slow down when your foot hits the ground — when you pair your watch with the HRM 600 monitor (sold separately)

• Polarized and Iridium™ lens options available

Mesh ventilation panels

Vivobarefoot Primus Trail Flow Womens mens This is the gel —Meet the new Primus Trail Flow, a natural off road performer. This streamlined silhouette provides both exceptional grip and responsive ground feel to move mindfully across a variety of terrains. The durable, breathable 100% recycled polyester mesh upper keeps those agile feet cool and secure with engineered, anti slip lacing.