The Salvimar Arm Strap is the perfect accessory for all divers. It's super low profile and lightweight, making it easy to wear with any gear and easy to attach to your arm, calf or thigh. This elastic band has Velcro that attaches it securely to your arm. As a diver you know how important it is to have a knife close by when you need it, so make sure you have one of these on hand.