Lazer Tardiz Helmet: White; XS/MD (50-57cm) Rollsys retention system; flexible ear covers; front and rear venting Aero shape and finish combine to make an exceptionally low drag TT helmet; optimal aerodynamics while riding with head down The color of the straps is aligned to the color of the individual helmet Flexible ear covers NOTE: There was a sizing change on this model between 2011 and 2012: A 2011 XS/MD is a 2012 MD. A 2011 LG/XL is a 2012 LG. The actual fit dimensions did not change at all; available in two sizes only