Exhibit 99.1

FORM 4
JOINT FILER INFORMATION



Name of "Reporting Persons":			 	Norwest Venture Partners XI, LP
							Norwest Venture Partners XII, LP
							Promod Haque
							Jeffrey Crowe
							Matthew D. Howard

Address:						525 University Avenue, Suite 800
							Palo Alto, CA  94301

Designated Filer:					Norwest Venture Partners XI, LP

Issuer and Ticker Symbol:				iRhythm Technologies, Inc. [IRTC]

Date of Earliest Transaction:				October 25, 2016



Each of the Joint Filers with Norwest Venture Partners XI, LP may be deemed to
share indirect beneficial ownership in the securities set forth on the attached
Form 4.

Norwest Venture Partners XI, LP ("NVP XI") is the record holder of shares
reported on Line 1 of Table I and Lines 1 and 2 of Table II. Norwest Venture
Partners XII, LP ("NVP XII") is record holder of the shares reported on Line 2
of Table I and Lines 3 and 4 of Table II. Messrs. Haque, Crowe and Howard are
Co-Chief Executive Officers of NVP Associates, LLC ("NVP Associates"), the
managing member of the general partner of NVP XI and NVP XII. By virtue of such
position, Messrs. Haque, Crowe and Howard may be deemed to beneficially own the
shares held of record by NVP XI and NVP XII.

All Reporting Persons disclaim beneficial ownership of shares of iRhythm
Technologies, Inc. stock held by each other Reporting Person, except to the
extent of their respective pecuniary interest therein. The filing of this
statement shall not be deemed an admission that, for purposes of Section 16 of
the Securities Exchange Act of 1934, or otherwise, any of the Reporting Persons
are the beneficial owners of all of the equity securities covered by this
statement.

Each of the Reporting Persons listed above hereby designates NVP XI as its
designated filer of Forms 3, 4 and 5 in accordance with Section 16(a) of the
Securities Exchange Act of 1934 and the rules thereunder.


							NORWEST VENTURE PARTNERS XI, LP
							By: Genesis VC Partners XI, LLC
							Its General Partner
							By: NVP Associates, LLC
							Its Managing Member


							By: /s/ Kurt Betcher
							Its Chief Financial Officer


							NORWEST VENTURE PARTNERS XII, LP
							By: Genesis VC Partners XII, LLC
							Its General Partner
							By: NVP Associates, LLC
							Its Managing Member


							By: /s/ Kurt Betcher
							Its Chief Financial Officer

PROMOD HAQUE
By: Kurt L. Betcher, as Attorney-in-Fact


							By: /s/ Kurt Betcher

JEFFREY CROWE
By: Kurt L. Betcher, as Attorney-in-Fact


							By: /s/ Kurt Betcher

MATTHEW D. HOWARD
By: Kurt L. Betcher, as Attorney-in-Fact

       							By: /s/ Kurt Betcher