NHL Boston Bruins Mens Cotton Sleepwear / Pajama Pants - Black & White (Size: M) 100% Cotton 100% authentic NHL merchandise....Very high quality mens sleepwear - satisfaction guaranteed Extremely high quality fabric: 100% cotton; Machine washable Fabric covered elastic waistband with inner drawstrings for added comfort Team name and logo printed allover the pant for a sporty look Relaxed styling provides a comfortable and casual fit; Functional button fly for convenience