Counterfeit lululemon tops & tanks usually fail on three things: the inside tag, the fabric and the hardware. Here is how to check each, with style-specific tells for Swiftly Tech Short Sleeve, Swiftly Tech Long Sleeve, Align Tank.
Check the inside tag first
Genuine lululemon uses crisp, heat-pressed inside tags (older pieces have sewn tags) with a fabric name that matches the style. Blurry printing, misspellings or a fabric name that does not belong to that style are immediate red flags.
Feel the fabric
Tops & Tanks from lululemon use specific fabrics: Swiftly Tech Short Sleeve is Seamless Swiftly; Swiftly Tech Long Sleeve is Seamless Swiftly; Align Tank is Nulu; Power Pivot Tank is Luxtreme. A counterfeit in the wrong fabric feels slippery, thin or stiff compared with the real thing.
Style-specific tells
Swiftly Tech Short Sleeve: Seamless construction with no side seams; a small 'Swiftly Tech' print inside the collar.
Swiftly Tech Long Sleeve: Same seamless build; check cuffs for stretch.
Align Tank: Nulu fabric and a heat-pressed inside tag.
Power Pivot Tank: Built-in bra with cup pockets.
How ThriftUp authenticates every piece
We check seamless tops for snags and runs, and cotton tops for underarm discoloration.
Any piece that fails a check is removed before grading. Buyers who find a non-authentic piece are covered by our claims policy.
Read next
- How to Spot Fake lululemon Jackets & Outerwear
- How to Authenticate lululemon Align Leggings
- How to Photograph and List Used lululemon Leggings
Pricing and fee figures are indicative and change; check current platform terms. ThriftUp is not affiliated with lululemon athletica.
Frequently asked questions
Where can I buy the stock discussed in this guide?
ThriftUp sells graded A/B pre-owned lululemon from 100 pieces; message us on WhatsApp with your quantity and categories.
How current is this guide?
Updated 2026-10-13. Resale prices and platform fees are reviewed regularly.