Boys ReefA(R) Little Rover Sandals :: Grom won't trip. Grom won't slip. The Little Rover sandal has a water-friendly synthetic nubuck upper a padded soft jersey liner and a super soft Swellular cushion footbed for ?instant comfort.? Most importantly these boys sandals have a ReefA(R) rubber outsole with Design Detailing for traction. Less falls and skinned knees equal more fun for you and for them.