BF-3 spreader boots from Sparcraft are protective covers designed to fit Isomat BF-3 spreader tips, reducing sail chafe and protecting both sails and rigging. Made from durable, marine-grade materials, they provide a smooth surface that minimizes friction during tacks and gybes. Ideal for smaller to mid-sized rigs, these boots are easy to install and help extend the lifespan of sails and standing rigging.