THE PRODUCT IS A 1ST QUALITY LYCRA FLEXIBLE SHIRT FABRIC. IN THIS WAY IT DOES NOT CAUSE SWEATING, IT DOES NOT KEEP SWEAT, AND IT DOES NOT CAUSE PILLING OR TITCHING. IF YOU PURCHASE ACCORDING TO THE SIZE CHART, THE PRODUCT WILL FIT YOU EXACTLY. SIZE CHART: SIZE S: BETWEEN 40-55 KG, SIZE M: BETWEEN 55-70 KG, SIZE L: BETWEEN 70-82 KG.