Women's US sizing These shoes are the most sustainable of the Icebug shoes. The upper is made from silver rated (LGW) leather and high felted shaft from Woolpower's scrap wool. The long medial zipper and the loop on top of the shaft makes the shoes easy to put on. The fleece lining keeps your feet warm. The shoes are equipped with 14 carbide steel studs which perform differently in various surfaces. On the soft ground the studs will go into the ground, on a hard surface the studs will partly retract into the rubber sole and the grip comes mainly from the rubber sole. On a hard and uneven surface, like when walking on the rocks, the grip is coming partly from the studs and partly from the rubber sole. - The upper leather is silver rated leather (rated by Leather Working Group Ltd). - The felted shaft and insole are made from the Woolpower®'s scarp merinowool. It's minimum of 50 % merinowool. The merinowool is mulesing free and produced in South Africa. Woolpower®-material contain