Lululemon Cool Racerback Tank Top This Versatile Racerback Was Designed To Stay Put And Out Of Your Way When You’re On The Move. Light Luon Light Luon Fabric Is A Lightweight Version Of Our Signature Four-Way Stretch, Sweat-Wicking Luon Fabric Lightweight Sweat-Wicking Four-Way Stretch Cottony-Soft Handfeel Naturally Breathable Color: Black Size 4 New Without Tag. Tried On.