Sire boots by caterpillar the sire boots by caterpillar are made from full grain leather making them durable as well as being fully waterproof these are the perfect boots for the season ahead manufactured using cat ease technology these boots are up to 15 lighter with 30 more bounce back than standard boots ease is shock absorbing which adds to your comfort ease comfort technology 15 lighter 30 more bounce back than standard rubber outsole full front lace fastening