Sorel Slimpack II Lace Boot in Black. - size 9 (also in 6,6.5,7,7.5) Sorel Slimpack II Lace Boot in Black. - size 9 (also in 6,6.5,7,7.5) Leather and man made upper with rubber sole. Lace-up front. Wool lining. Waterproof. Heel measures approx 1.5 H. SORE-WZ5. 1702251. Founded by social entrepreneur and travel writer Leila Janah, Sorels are functional, beautifully crafted boots created for those who are not afraid to create, to accomplish, to do. They are made with purpose, for those with purpose.