Petzl Aria are high-quality and durable headlamps from a renowned manufacturer, which are primarily intended for unobtrusive activities in nature - whether you are going to hunt or "just" observe. Despite the durable design, you may still need a spare part for the Aria headlamps here and there.
The headband for Petzl Aria headlamps is removable and washable. But by taking it off, you can also lose it separately, which just happens sometimes. That's why it's advisable to stock up on a spare strap right away - the moment you lose one, you won't have to wait days for another one to be delivered, but you'll be able to be operational.
Buy Petzl® Spare strap for headlamp Aria for € 7