Genovi Men's Master-Crafted Muscle Shirts Imported The product of Cotton, Modal and Elastane blended with 10 years of product development and an obsession with comfort Narrow neck collar piping sits perfectly on the collar without on obtrusion or irritation Flat-lock stitching on arm opening seams prevents the arm openings to ride up or stretch out of proportion T-shirt waist opening grip allows the shirt to be tucked in without pulling out of pants during daily movement Optic white and jet black colors designed to maintain vibrancy through the test of time. Wash. Wear. Repeat.