FEATURES of the Tretorn Women"s Plask Mid Boot Fit: Standard Upper: 100% wateproof natural rubber PVC free Matte Finish Lining: Textile Sockliner: Textile, 100% post industrial mesh Insole: Swedish Massage Technology molded EVA Midsole: Rubber Outsole: Rubber Collar Width: 11" / 280 mm Calf Width: 11.4" / 290 mm Shaft Height: 7.5" / 190 mm Heel Height: 2.5" / 6.5 cm