Fig. 10. Gumfooted lines consist of two pairs of silk fibers that are coated with an aggregate silk glue along their lower 5-15 mm. One pair of fibers has a larger diameter and runs continuously from the sheet to the substrate. The second pair of smaller diameter silk fibers is cut by the spiders just above an attachment point to the larger fibers. Thus, the `foot' of the line consists of four fibers that are viscid (glue covered) along their base and are then dry until the attachment point, while the bulk of the gumfoot is two dry, large diameter fibers.