Rosebank Oasis Adult Helmet - S/M - Green Get out & get riding with the Rosebank Oasis Helmet. With its sporty look & feel, this helmet is designed as a tough poly-carb inmould helmet featuring an adjustable comfort fit system. It's lightweight and features comfort pads along with 18 vents for optimised airflow & cooling. Australian standards approved, this helmet comes in a modern charcoal green colourway. Available in SM size: 54-59 cm head size for ages 7+.