LIMITED POWER OF ATTORNEY FOR ROBERT DAY
                  BENEFICIAL OWNERSHIP REPORTING OBLIGATIONS


Know all by these presents, that the undersigned hereby makes, constitutes and
appoints Robert Miller, acting individually, as the undersigned's true and
lawful attorney-in-fact, with full power and authority as hereinafter described
on behalf of and in the name, place and stead of the undersigned to:

    (1)   prepare, execute, acknowledge, deliver and file Schedules 13G, 13D,
          Forms 3, 4, and 5 (including any amendments thereto), including
          applications for Form ID, and any documents necessary to facilitate
          the filing of beneficial ownership reports, with respect to the
          securities of Liberty Oilfield Services Inc. (the "Company"), with the
          United States Securities and Exchange Commission, any national
          securities exchanges and the Company, as considered necessary or
          advisable under Sections 13(d) and 16(a) of the Securities Exchange
          Act of 1934 and the rules and regulations promulgated thereunder, as
          amended from time to time (the "Exchange Act");

    (2)   seek or obtain, as the undersigned's representative and on the
          undersigned's behalf, information on transactions in the Company's
          securities from any third party, including brokers, employee benefit
          plan administrators and trustees, and the undersigned hereby
          authorizes any such person to release any such information to the
          undersigned and approves and ratifies any such release of information;
          and

    (3)   perform any and all other acts which in the discretion of the
          attorney-in-fact are necessary or desirable for and on behalf of the
          undersigned in connection with the foregoing.

The undersigned acknowledges that:

    (1)   this Limited Power of Attorney authorizes, but does not require, the
          attorney-in-fact to act in his discretion on information provided to
          the attorney-in-fact without independent verification of such
          information;

    (2)   any documents prepared and/or executed by any the attorney-in-fact on
          behalf of the undersigned pursuant to this Limited Power of Attorney
          will be in such form and will contain such information and disclosure
          as the attorney-in-fact, in his or her discretion, deems necessary or
          desirable;

    (3)   neither the Company nor the attorney-in-fact assumes: (i) any
          liability for the undersigned's responsibility to comply with the
          requirements of the Exchange Act, (ii) any liability of the
          undersigned for any failure to comply with such requirements, or (iii)
          any obligation or liability of the undersigned for profit disgorgement
          under Sections 13(d) and 16(b) of the Exchange Act; and

    (4)   this Limited Power of Attorney does not relieve the undersigned from
          responsibility for compliance with the undersigned's obligations under
          the Exchange Act, including without limitation the reporting
          requirements under Sections 13(d) and 16 of the Exchange Act.

The undersigned hereby gives and grants each of the foregoing attorney-in-fact
full power and authority to do and perform all and every act and thing
whatsoever requisite, necessary or appropriate to be done in and about the
foregoing matters as fully to all intents and purposes as the undersigned might
or could do if present, hereby ratifying all that the attorney-in-fact of, for
and on behalf of the undersigned, shall lawfully do or cause to be done by
virtue of this Limited Power of Attorney.

This Limited Power of Attorney shall remain in full force and effect until
revoked by the undersigned in a signed writing delivered to the attorney-in-
fact.

          IN WITNESS WHEREOF, the undersigned has caused this Limited Power of
Attorney to be executed as of this 2nd day of February, 2018.

Signature


 /s/ Robert A. Day
--------------------------------
Robert A. Day