Below, you can find the full FFXIV: Heavensward item info for the Invisible Silk item. This item is a Cloth and is usually a crafting material or the product of a craft. Sometimes it can be dropped from a monster or found in a chest.
Fiber Cloth Feathers
Invisible Silk | ||||
Cloth Level: 1 | Item Level: 250 NPC: 2 | |||
Silk so thin, it is barely discernable with the naked eye, despite proving as tensile as normal silken thread. Only silkworms bred under strict conditions will produce such fiber. |