Tretorn Rubber Boot Size Chart Tretorn"s Skerry unisex rubber boots were designed for sailing, but are well suited for city adventures. This classic mid-calf yellow rain boot is a rainy day staple. Features - 100% waterproof, natural rubber upper. - PVC free. - Matte finish. - Collar width: 29 cm. - Shaft height: 14 cm. - Textile lining. - Swedish Masssage Technology molded EVA insole. - Rubber midsole and outsole.. Tretorn Rubber Size Chart