This Lululemon Get Set long sleeve open back tee is a great piece for your active wardrobe. The material is Lululemon’s Seriously Light Luon that is super lightweight and made to wick sweat. There is not a size tag, but based on the measurement of about 23.5 inches from one underarm seam to the other, it should be a size 12. If you are new to Poshmark, please use my referral code to get $10 off your first purchase: https://posh.mk/t8x27K4T0Lb Ask any questions you may have 💜 Feel free to make an offer 💚 Bundle & Save! 🧡