This tank is knit with ring-spun yarn, which means it's made by twisting and thinning the strands to make a very fine, strong, soft rope of fibers. Translation: soft, durable, lightweight... did we already say soft? Our signature Tri-Blend Fabric. Tri, for three, different fabrics blended together. 50% Polyester + 38% Cotton + 12% Rayon = Tri-blend. Voilà!