Youth Bike Helmets

Adult or youth size helmet?
Head is 55-57 cm. is it good for? well it will fit? http://www.target.com/Adults% E2% 80% 99-Bell-Adrenaline-Helmet-Black/dp/B000OW322W/sr 1-1/qid = = 1214248819/ref = sr_1_1/602 -0819538-8073413? ie = UTF8 & index = target & rh = k% 3Abike% 20helmet% 20black% 20bell & page = 1 btw. I can not try it [...]