secured to constrain the yarn as it is removed from the shuttle during weaving the presence of pile fabric whithin the chamber will not impede loading since not only is the lid 35 held in an open position but also the pile will be 34 laid flat 34 or at least deflected by the air stream in which the yarn is entrained during loading of the shuttle it is also possible to provide the shuttle base and side walls with serrated or roughened elements or to line them with pile fabric if desired the shuttle is shown in fig2 to 4 and as can be seen one at least of the chamber walls is movable relative to the others whereby by separating the walls effectively to enlarge the chamber weft yarn can easily be loaded subsequent to loading of the chamber with weft yarn the movable wall or walls is or are moved in the opposite sense thus to reduce the size of the chamber to enable restraint to be applied to the yarn as it is being removed from the chamber thus as can be seen there is provided a shuttle the body of which has a base 29 and side walls 30 and 31 these side walls come above the base to house the weft yarn 32 and extend below the base so as to fit in the shed between warp yarns 33 and reed 34 of the loom a lid 35 is attached to.