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Cut in a boxy silhouette with easy structure, this relaxed shirt features a front yoke seam and a classic pointed collar for a tailored finish. Lightweight yet warm, it’s ideal for transitional dressing—worn solo or layered as the season shifts. It’s crafted from fine Italian wool flannel that’s soft, lightweight and has a sophisticated look.
Sleek Flannel is crafted with premium merino wool that is traceable to certified responsibly managed Malahide farm in Tasmania, Australia. This quality is then woven by a fourth-generation Italian mill, emphasizing sustainability by utilizing renewable energy and decreasing water usage and emissions.
Questions on fit, sizing, or styling? Click the chat icon to connect with one of our Personal Stylists.
Style #:
P0801501
Fit
True to size, choose your normal size
Relaxed fit, long sleeves
Short length
Model is 5’11” and wearing a US size S
Materials & Care
Composition
100% virgin wool
Care
Do not wash. Do not bleach. Do not tumble dry. Warm iron if needed. Dry clean with any solvent except trichloroethylene. Imported
Sustainability & Traceability
We are committed to making a positive impact on the people who wear our clothes, our industry, and our planet, beginning with our Good Fabrics. Learn more about Theory for Good
Sleek Flannel is crafted with premium merino wool that is traceable to certified responsibly managed Malahide farm in Tasmania, Australia. This quality is then woven by a fourth-generation Italian mill emphasizing sustainability by utilizing renewable energy and decreasing water usage and emissions.
Traceability
Finished Garment Manufacturing:
Vietnam
Fabric Production:
Italy
Fabric Weaving or Knitting:
Italy
Fabric Dyeing:
Italy
Fabric Finishing:
Italy
Circularity + Resale
Theory’s garments are made to last. We encourage you to rewear, repair, and care for your garments. When they have lived a full life in your closet and are ready for the next chapter, there are two easy ways to achieve this. Resell your Theory pieces on Poshmark directly from your order history in just one click or donate them to our charity partners through Theory for Good Circle at any U.S. Theory location. Find a store near you.
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Exclusions
FALL LIMITED-TIME OFFER
*The Limited-Time offer in select countries online at theory.com and in Theory full-price stores through October 27th, 2026 at 3:59AM EDT. Discount will be auto-applied to the eligible items. May not be used in Theory Outlet U.S. stores. Items 40% off and higher are FINAL SALE and are not eligible for return, or credit. Final Sale items can only be exchanged for a different size of the same style & color, subject to availability. Offer cannot be combined with any promotional offers. Exclusions apply. Merchandise sold as is. Offer cannot be redeemed for cash or gift cards, or applied to previous purchases. For questions, please contact clientservice@theory.com. Offer terms are subject to change.
WELCOME
*Offer valid for 31 days from date of issue for first-time email subscribers only. Code is valid for one time use only and discount will be applied when your unique promotional code is entered at checkout. Offer valid in Theory U.S. retail stores and online at theory.com in select countries. Offer may not be used at Theory Outlet channels. Offer valid on full priced products only. Sale Merchandise, Theory gift cards, Common Projects products are excluded. Offer cannot be combined with any other promotional offer. Offer cannot be redeemed for cash or gift cards or applied to previous purchases. In-store gift with purchase is only valid for first-time customers. Items 40% off and higher are FINAL SALE and are not eligible for return, or credit. Final Sale items can only be exchanged for a different size of the same style & color, subject to availability. For questions, please contact clientservice@theory.com. Offer terms are subject to change.
ESSENTIAL DUOS AND TRIOS
*Choose 2 or 3 of the same marked style in any size or color to receive an additional discount. Applicable styles will be marked. Discount will be auto-applied at checkout. Offer valid in Theory retail stores and online at theory.com in select countries. Offer may not be used at Theory Outlet channels. Items 40% off and higher are FINAL SALE and are not eligible for return, or credit. Final Sale items can only be exchanged for a different size of the same style & color, subject to availability. Sale merchandise sold as is. Offer cannot be combined with any other promotional offer, redeemed for cash or gift cards, or applied to previous purchases. For questions, please contact clientservice@theory.com. Offer terms are subject to change.
FIRST IN APP PURCHASE
*Discount will be applied when your promotional code is entered at checkout and code is valid for one time use only. Offer valid in the Theory App. Select merchandise, Theory gift cards, Common Projects products and sale merchandise are excluded. Offer can be combined with select other promotional offers. Items 40% off and higher are FINAL SALE and are not eligible for return, or credit. Final Sale items can only be exchanged for a different size of the same style & color, subject to availability. Offer cannot be redeemed for cash or gift cards or applied to previous purchases. For questions, please contact clientservice@theory.com. Offer terms are subject to change.
STUDENT & GRADUATE DISCOUNT
15% off select full-priced merchandise. Discount only open to students and graduates (within 5 years) with valid identification. Offer valid only on theory.com, may not be used at Theory stores, Theoryoutlet.com or Theory Outlet stores. Select merchandise, Theory gift cards, Common Projects products and sale merchandise are excluded. Offer cannot be combined with any other promotional offers. Offer cannot be redeemed for cash or gift cards, or applied to previous purchases. Items 40% off and higher are FINAL SALE and are not eligible for return, or credit. Final Sale items can only be exchanged for a different size of the same style & color, subject to availability. Only valid in the United States. Some exclusions may apply. For questions, please contact clientservice@theory.com. Offer terms are subject to change.
THEORY MEATPACKING IN-STORE TAILORING EVENT
Services apply at Theory Meatpacking only and are subject to change. All purchases must be made at Theory Meatpacking same day to qualify for complimentary alterations.
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