NHL Boston Bruins MENS Plaid Sleepwear / Pajama Pants 100% authentic NHL merchandise, satisfaction guaranteed. EXCELLENT FABRIC: 60% cotton, 40% polyester; High quality machine washable material. Team logo embrodiered on left leg for a sporty look. Two hand pockets; Fabric covered elastic waistband with drawstrings for added comfort. Relaxed styling provides a comfortable and casual fit; Functional button fly for convenience.