In mesh we trust...it is one of the COOLEST fabrics, both in style and in comfort. This all mesh poncho-style top features a jagged hem, wide neckline, and arm holes for ease of wear. The standard sizing is a one size (OS) fits XS-L because of its flow-y nature. The plus sizes come in 1X-3X to grade accurately for the plus size figure. This fabric is VERY soft and VERY stretchy (fits 1 to 2 sizes larger if needed)...the ultimate in comfortable cool. Made of 95% Polyester, 5% Spandex.