Why choose Core LS？

1. Powerful Posture correction technology. 2. Organic Silky fabric. 3. No Chest logo. 4. Extended arm length for better shoulder health.

The Core Long Sleeve by Forme® is your go-to long sleeve tee—with all the posture-correcting benefits you love, now with extra coverage and support. Perfect for everyday wear, lounging, travel, or sleep, it combines comfort, style, and effective alignment correction.

Made from the same ultra-soft, breathable, and eco-friendly Tencel™ fabric as our signature Core Tee, this FDA-registered tee features dual layers of patented posture technology for a stronger, more supportive fit. It gently engages your muscles to keep your shoulders back and your spine aligned—helping to ease neck, back, and shoulder pain linked to spinal issues, without restricting movement.

Developed by an orthopedic surgeon for his mother, who battled late-stage cancer and suffered from poor posture and compressed lungs, Forme® transforms your body by building a foundation that enables you to perform, think, and live at your highest potential.

Fit Tip: If you experience pressure under the arms, consider sizing up or layering the Core Long Sleeve over a light tee to ease your transition.

How to Wear Forme®?

Forme® is designed to be worn as part of your everyday routine, at work, while traveling, during workouts, athletics, rehab, post surgery, or even while sleeping.

✔ Begin by wearing for a few hours per day during the first 1–2 weeks to allow the body to gradually adapt to changes in muscle activation and postural alignment.

✔ An immediate improvement in posture may be observed upon wear, without conscious effort, due to the smart apparel's integrated alignment technology.

✔ Mild muscle soreness may occur within 1–2 days of initial use, similar to muscle adaptation or training fatigue. If discomfort occurs, discontinue use for 1–2 days before resuming wear.

Full Body Alignment: Pair with the Ergo Short and Arch Booster Sock or Ankle Guard Sock.

Advanced Support: Visit our Health Benefits page for guidance on musculoskeletal conditions.

✔ HSA/FSA Eligible: To use HSA/FSA funds, please check out with Flex. Receipts cannot be issued post-purchase.