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COVER
 12 Months Ended
Dec. 31, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2025
Current Fiscal Year End Date --12-31
Entity File Number 001-41943
Entity Registrant Name Amer Sports, Inc.
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One Cricket Square, Hutchins Drive
Entity Address, Address Line Two P.O. Box 2681
Entity Address, City or Town Grand Cayman
Entity Address, Postal Zip Code KY1-1111
Entity Address, Country KY
Title of 12(b) Security Ordinary shares, par valueEUR 0.0300580119630888 per share
Trading Symbol AS
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 557,667,387
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0001988894
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Amendment Flag false
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 149 Fifth Avenue, 9th Floor
Entity Address, City or Town New York
Entity Address, Postal Zip Code 10010
Contact Personnel Name Andrew E. Page
Entity Address, State or Province NY
City Area Code 646
Local Phone Number 930-3600