64 6401 Waterproof footwear with outer soles and uppers of rubber or of plastics, the uppers of which are neither fixed to the sole nor assembled by stitching, riveting, nailing, screwing, plugging or similar processes: 6401.10.0000 Footwear incorporating a protective metal toe-cap... Prs. Other footwear: 6401.91.0000 Covering the knee................................ Prs. 6401.92 Covering the ankle but not covering the knee: 6401.92.3000 Ski-boots..................................... Prs. 6401.92.7000 Other......................................... Prs. 6401.99.0000 Other............................................ Prs. 6402 Other footwear, with outer soles and uppers of rubber or plastics: