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Celebrate Father's Day | Enjoy an exclusive offer when you purchase any full-price men's style*. SHOP MEN T&C apply

New Markdown Added | End of Season Sale | Close out the season with styles at can't-miss prices. SHOP WOMEN SHOP MEN

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Men's Shirts

Crisp, clean, and versatile, these are the styles you'll turn to again and again.

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ HK$ 1,650.00

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ HK$ 1,650.00

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ HK$ 1,650.00

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ HK$ 1,650.00

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Sylvain Shirt in Good Cotton

null ~~Price reduced from to~~ HK$ 1,650.00

Purchase 3 Pieces to Unlock Bundle Price

Short-Sleeve Overshirt in Textured Nylon

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Short-Sleeve Overshirt in Textured Nylon

null ~~Price reduced from to~~ HK$ 1,800.00

Savings on your order with any full‑price men’s style

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Short-Sleeve Overshirt in Textured Nylon

null ~~Price reduced from to~~ HK$ 1,800.00

Savings on your order with any full‑price men’s style

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Noll Short-Sleeve Shirt in Kelso Nylon

null ~~Price reduced from to~~ HK$ 1,850.00

Savings on your order with any full‑price men’s style

Weekend Short-Sleeve Shirt in Textured Cotton

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Weekend Short-Sleeve Shirt in Textured Cotton

null ~~Price reduced from to~~ HK$ 1,600.00

Savings on your order with any full‑price men’s style

Quick Add

Sylvain Shirt in Good Cotton

null ~~Price reduced from to~~ HK$ 1,650.00

Purchase 3 Pieces to Unlock Bundle Price

Quick Add

Sylvain Shirt in Good Cotton

null ~~Price reduced from to~~ HK$ 1,650.00

Purchase 3 Pieces to Unlock Bundle Price

Quick Add

Sylvain Shirt in Good Cotton

null ~~Price reduced from to~~ HK$ 1,650.00

Purchase 3 Pieces to Unlock Bundle Price

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WELCOME OFFER
(1) Promotional Period: From April 1, 2024 until further notice. (2) Eligibility: Customers who successfully subscribe to Theory Newsletters during the Promotional Period (“Eligible Customers”). (3) Designated Store in respect of this Promotion: The new Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (4) How to enjoy this Promotion: Eligible Customers can enjoy 15% off on regular-priced products at Theory Online Stores (subject to the Excluded Products as defined below) (the “Discount”) by entering the promotional code at checkout. The promotional code would be sent, via email, to Eligible Customers upon successful newsletter registration. (5) General Terms and Conditions: The Discount only applies to the first order placed by Eligible Customers on Theory Online Stores. The Discount does not apply to the purchase of Theory Project products, Bundles and permanent/core items (the “Excluded Products”). The Discount cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

BUNDLE PROMOTION
(1) Promotional Period: The Promotional Period is from 1 July, 2025 until further notice. (2) Designated Store in respect of this Promotion: Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (3) How to enjoy this Promotion: During the Promotional Period, all customers can enjoy an additional discount upon purchasing, as the case maybe, 2 or 3 items of the same style (as may be designated by Theory from time to time) in any size or color (collectively the “Designated Items”) in one single transaction at Theory Online Stores (collectively the “Discount”). The Designated items, and the number of Designated Items required to be purchased to unlock the Discount, will be specifically marked on Theory Online Stores. Customers are required to add the Designated Items into bag to unlock the amount of the Discount. The Discount will automatically apply at checkout. (4) General Terms and Conditions: The Discount cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

STUDENT PROGRAM
(1) Promotional Period: The Promotional Period is from September 15, 2025 to August 31, 2026 (both days inclusive). (2) Eligibility: (i) Undergraduate and postgraduate students at universities in Hong Kong (the “University Students”); and (ii) University Students graduating in the year of 2025 (collectively the “Eligible Customers”). (3) Designated Store in respect of this Promotion: Theory Online Store at hk.theory.com (collectively “Theory Online Store”). (4) How to enjoy this Promotion: During the Promotional Period, Eligible Customers can enjoy a 25% discount on selected items (the “Discount”) at Theory Online Store by emailing a soft copy of a valid university student card issued by any universities in Hong Kong (the “Valid Student Card”) to our Customer Service team at customerservicehk@theory.com to verify identity. Upon successful verification, Eligible Customers would receive a unique, single use promotional code (the “Promotional Code”) via email. Eligible Customers can enjoy the Discount by inserting the Promotional Code at checkout. For verification purpose, University Students grading in the year of 2025 shall provide a Valid Student Card which shall remain valid within the year of 2025. (5) General Terms and Conditions: The Discount does not apply to Bundles. The Promotional Code would expire once used. Save and except designated gift offers designated by Theory from time to time, the promotion cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, shopping mall loyalty program discounts (where applicable), other Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. Customers who provide inaccurate information would not be eligible to enjoy this promotional offer. This promotional offer cannot be used in conjunction with Theory staff discount. To enjoy this promotional offer, Eligible Customers agree and acknowledge that our Customer Service team is entitled to receive a soft copy of the Valid Student Cards for verification and record-keeping purpose. By participating in the promotion, Eligible Customers are deemed to agree with and be bound by these Terms and Conditions and Theory's Privacy Policy at https://hk.theory.com/privacy-policy_hk.html. Eligible Customers agree and acknowledge that Theory will only use the personal data collected for the purposes of this promotional offer, and the information will be kept strictly confidential. Unless otherwise agreed by the Eligible Customers, their personal data will not be used for any other purpose (including but not limited to direct marketing purpose) and will be destroyed after the relevant purposes are completed. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

HANG SENG YEAR-ROUND OFFER
(1) Promotional Period: The Promotional Period is from 1 February, 2026 to 31 December, 2026 (both days inclusive). (2) Eligibility: Hang Seng Credit Card Holders (collectively the “Eligible Customers”). (3) Designated Store in respect of this Promotion: (i) Hong Kong Online Store at hk.theory.com; and (ii) Theory Stores at Pacific Place, ifc mall, Lee Garden Two, Harbour City, New Town Plaza, Cityplaza (collectively “Theory Physical Stores”, together with Theory Online Store, the “Theory Stores”). (4) How to enjoy this Promotion: During the relevant Promotional Period(s), Eligible Customers can enjoy a 10% discount on regularpriced items at Theory Stores (the “Discount”) by fully settling all spending in respect of the relevant transaction by Hang Seng Credit Card. To enjoy the Discount for purchases made at Theory Online Store, Eligible Customers must enter the promotional code “theoryhs” provided to Eligible Customers at checkout. (5) General Terms and Conditions: The Discount does not apply to Bundles and permanent/core items. Save and except shopping mall coupons (where applicable) and designated gift offers designated by Theory from time to time, the promotion cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, shopping mall loyalty program discounts (where applicable), other Credit Card Year-Round Discount and Theory CRM Coupons). The promotion cannot be transferred nor exchanged for cash or any other gifts or coupons. This promotional offer cannot be used in conjunction with Theory staff discount. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute. The Chinese version of these Terms and Conditions is for reference only. In case of discrepancy between the Chinese and English versions of these Terms and Conditions, the English version shall prevail.

FATHER'S DAY CELEBRATION PROMOTION
(1) Promotional Period: The Promotional Period is from 13 June, 2026 to 21 June, 2026 (both days inclusive). (2) Designated Store in respect of this Promotion: (i) Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (ii) Theory Stores at Pacific Place, IFC mall, Lee Garden Two, Harbour City, New Town Plaza, Cityplaza (collectively “Theory Physical Stores”, together with Theory Hong Kong Online Store, the “Theory Stores”). (3) How to enjoy this Promotion: During the Promotional Period, all customers can enjoy a 15% discount (collectively “Discount”) upon purchase of one regular‑priced menswear items (the "Purchase Threshold"), in one single transaction at Theory Stores. The Discount will automatically apply at checkout. For the avoidance of doubt, the purchase of a set of MAP Bundles shall be counted as the purchase of menswear item within the Purchase Threshold. (4) General Terms and Conditions: The Discount does not apply to Bundles items, permanent/core and discounted products (the “Excluded Products”). Save and except shopping mall coupons and designated “Gift With Purchase” offers designated by Theory from time to time, the Discount cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, shopping mall loyalty program discounts, Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. No exchange or return would be provided for products purchased with the Discount under this promotion. This promotional offer cannot be used in conjunction with Theory staff discount. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.