Vivobarefoot Primus Trail Knit FG Grounding Womens Wood COLLECTIONS Mens The lightweight Primus outsole is Shoe size:UK2.5 EU35 The lightweight Primus outsole is designed to bring your feet as close to the ground as possible while providing protection for training and urban environments The Motus Strength II is engineered to withstand abrasion and protect during heavy‑duty training – from rope climbs and sled pushes to intervals and strength work like barbell lifts and kettlebell drills – all without losing barefoot feel The Vivobarefoot Primus Trail Knit FG Grounded is more than a trail shoe—it's an invitation to move naturally The primary materials used in the Primus Trail Knit FG Grounded are synthetic and are not derived from animals