The Reef boys Ahi is a soft & water-friendly sandal with a padded synthetic nubuck strap. The footbed is made from a spongy contoured EVA with anatomical arch support. The outsole is durable high-density EVA with a grippy Reef tread pattern. PLEASE NOTE: The 4 smallest sizes (uk 2/3 4/5 6/7 8/9) come with an elasticated removable back-strap.