Made of soft cotton spandex, which is stretchable.
Same fitness as your basic shirt.
Size guide (chest x waist, in inches)
Xsmall - 33" and 31"
Small- 34" and 32"
Medium- 35" and 33"
Large- 36" and 34"
XL- 37" and 35"
2XL-38" and 36"
3XL- 39" and 37"
Please note that the fabric stretches upto 4 inches. Please take your usual size.