an endoluminal prosthesis including a first polymer member bonded to a second polymer member to selectively encapsulate a stent . selective bonding between the first and second polymer members results in unbonded regions or pockets that accommodate movement of the stent , permitting compression of the prosthesis using minimal force and enabling collapse of the prosthesis to a low profile . the pockets are believed to encourage enhanced cellular penetration for rapid healing and may contain bioactive substances .