Pedag Alaska: A layer of pure lamb"s wool attached to a non-slip perforated latex base. After wearing for a while, the friction caused by the motion of your feet will produce a layer of felted wool. Alaska is made to fit into most regular shoes and boots; however it is not as wide as a shearling boot replacement insole. Alaska is not a shearling insole. Shearling is wool still attached to the hide. Alaska is made of wool trimmed from the hide and attached it to a latex bottom. Pedag Pascha is genuine shearling attached to a natural cork base. Pascha is also not as wide as a shearling boot replacement insole. Pascha will fit into regular most shoes and boots that have a little room.