Lululemon Back in Action, Modern Stripe Heathered Black and White -SizeXL From the website: This super-soft long sleeve is a classic you can reach for again and again. The scooped back hem provides extra coverage, while added stretch allows you to move throughout your day with ease. -Pima Cotton fabric is breathable and soft against your skin Designed for: On the Move Lycra®: Added Lycra® fibre for shape retention Relaxed fit: Gives you room to move without restriction Coverage: Longer in back Lycra®: Added Lycra® fibre for shape retention