A medical device includes a polymer scaffold (10) crimped to a catheter having an expansion balloon (12). A sheath pair (20,30) is placed over the crimped scaffold after crimping to reduce recoil of the crimped polymer scaffold and maintain scaffold-balloon engagement relied on to hold the scaffold to the balloon when the scaffold is being delivered to a target in a body. The sheath pair is removed by a health professional before placing the scaffold within the body.