Get your Harleys ready! The cool looking skull tank incorporates simple metal rings around the bottom trim making it extra "hard rock!" 100% cotton. SizeLengthNeckGirth XS7-9"7-9"11-14" S9-11"9-11"14-17" M11-13"11-12"17-19" MM11-13"11.5-13.5"18-20" L13-15"12-14"19-21" XL15-17"14-15"21-23"