This excerpt taken from the NKE 10-Q filed Jan 7, 2009.
Change Deadline,” which shall be a number of days prior to the Purchase Date for that Offering with the exact number of days being established from time to time by the Authorized Officer by written notice to participants. Except as provided in paragraph 6(g) below, participation in the Plan shall also terminate when a participant ceases to be an Eligible Employee for any reason, including death or retirement. A participant may not reinstate participation in the Plan with respect to a particular Offering after once terminating participation in the Plan with respect to that Offering. Upon termination of a participant’s participation in the Plan, all amounts deducted from the participant’s Compensation or otherwise contributed by the participant, and not previously used to purchase shares under the Plan, shall be returned to the participant.