Lululemon Back In Action Short Sleeve Size 6 Heathered Core Medium Grey. In great used condition! From website- Back in Action Short Sleeve 1. A classic short sleeve you'll reach for again and again. The scooped back hem adds length for when you want a bit more coverage. 2. Made with breathable pima cotton fabric for the ultimate in softness and stretch. 3. Added Lycra® fibre for stretch and shape retention. 4. Relaxed fit. 5. Longer in back.