The Primus Sport II is not your regular trainer, built to move and grow as close to your barefoot as possible. The trainer is equipped with full sensory feedback, allowing growth of strong, flexible feet. They are designed with ultra thin, puncture-resistant soles which means they do not mold around only one kids feet and allows them to be safely passed on and re-loved, promoting circular fashion. Sizes 20-32 feature a sock-like collar for a snug fit with a velcro strap for your little ones to put on themselves. Sizes 33-36 also feature a sock-like collar for a snug fit however with a sport look elastic toggle fastening. The sole has a 2mm base and 2mm sticky rubber hexagon design allowing for the feet to feel the ground and move naturally. These trainers are vegan, made from animal free products and meet the Vivobarefoot vegan definition. Made from recycled materials, reusing post-consumer plastic waste, helping to reduce our waste to landfill. Made in Vietnam.