From D&D Wiki
|This material is published under the OGL|
Price 10,000 gp; Aura moderate transmutation; CL 7th; Weight 1 lb.
This ruffled silk cloak is incredibly durable despite its soft, delicate construction. Anytime the wearer falls asleep (whether the sleep is natural or brought on by a magical effect), the cloak immediately transforms into sticky strands that envelop the wearer's body, hardening into a solid silk cocoon. While wrapped in the cocoon the wearer gains a +4 enhancement bonus to natural armor and is protected from critical hits and sneak attacks as if subject to the light fortification armor ability (25% chance for normal damage on a critical hit). The cocoon opens and transforms back into a cloak once the wearer awakens.
Cost 5,000 gp