A zip slider comprising a body movable along opposing pairs of zip teeth to cause inter and extradigitation of the zip teeth; a pull tab pivotally mounted to the body and having a resting position in which it lies against the body and a pulling position in which it is pivoted from the resting position; a resting bias acting upon the pull tab, and through a first range of pivoting motion of the pull tab, the resting bias acting to bias the pull tab into the resting position, the resting bias comprising a cam located upon the pull tab and a biasing spring retained to the body and having a follower surface which bears against the cam, the biasing spring having a locking prong which is engaged with interdigitated teeth to prevent relative motion of the slider and teeth when the pull tab is in the resting position, and disengaged to permit the relative motion when in the pulling position, wherein the cam and biasing spring are configured such that: a). the action of the cam on the follower surface biases the pull tab into the resting position; b). when the pull tab is in the resting position, the locking prong bears against the interdigitated teeth; c). when the pull tab is in the pulling position, the action of the cam on the follower surface raises the locking prong above the teeth, wherein the pull tab includes a shaft journalled for rotation relative to the body, thereby to provide pivotal mounting of the pull tab relative to the body and a nib distal to the shaft by means of which the pull tab can be gripped, and wherein the cam is located on the shaft, a damping bias acting to apply a damping bias to the pull tab relative to the body when in the resting position, characterised in that the damping bias comprises a damping spring which acts between the body and the nib of the pull tab, thereby to urge the nib away from the body. a pull tab pivotally mounted to the body and having a resting position in which it lies against the body and a pulling position in which it is pivoted from the resting position; a resting bias acting upon the pull tab, and through a first range of pivoting motion of the pull tab, the resting bias acting to bias the pull tab into the resting position, the resting bias comprising a cam located upon the pull tab and a biasing spring retained to the body and having a follower surface which bears against the cam, the biasing spring having a locking prong which is engaged with interdigitated teeth to prevent relative motion of the slider and teeth when the pull tab is in the resting position, and disengaged to permit the relative motion when in the pulling position, wherein the cam and biasing spring are configured such that: a). the action of the cam on the follower surface biases the pull tab into the resting position; b). when the pull tab is in the resting position, the locking prong bears against the interdigitated teeth; c). when the pull tab is in the pulling position, the action of the cam on the follower surface raises the locking prong above the teeth, a). the action of the cam on the follower surface biases the pull tab into the resting position; b). when the pull tab is in the resting position, the locking prong bears against the interdigitated teeth; c). when the pull tab is in the pulling position, the action of the cam on the follower surface raises the locking prong above the teeth, wherein the pull tab includes a shaft journalled for rotation relative to the body, thereby to provide pivotal mounting of the pull tab relative to the body and a nib distal to the shaft by means of which the pull tab can be gripped, and wherein the cam is located on the shaft, a damping bias acting to apply a damping bias to the pull tab relative to the body when in the resting position, characterised in that the damping bias comprises a damping spring which acts between the body and the nib of the pull tab, thereby to urge the nib away from the body.