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EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Ronald W. Kisling, Chief Financial Officer of Fitbit, Inc., do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

•	the Quarterly Report on Form 10-Q of Fitbit, Inc. for the fiscal quarter ended June 29, 2019 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

•	the information contained in such Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Fitbit, Inc.

Date:	August 2, 2019	By:	/s/ Ronald W. Kisling
			Ronald W. Kisling
			Chief Financial Officer (Principal Financial and Accounting Officer)