OMS Mask Strap with Buckles A12918012 OMS Neoprene Mask Strap with Buckles. Neoprene and Webbing Fully Adjustable Mask Strap printed with the stylish OMS logo. Replaces the Standard Rubber or Silicone strap on most types of Dive & Snorkelling Masks providing additional comfort & quick easy adjustment, 3 Bar Sliding Nylon Buckles provide quick and simple adjustment to ensure a perfect fit prior to diving or snorkelling. Weighs 0.04 Kgs.