I'd say safer than a resin band, and at least as safe as a casio velcro band.
Originally I thought they were supposed to be fastened using the same pattern as you'd use on a motorbike helmet (if you've ever used a motorbike helmet, you'd know what I mean). That would make them extremely secure. However, it looks like you're just supposed to fold the excess strap back under both loops. It's still very secure.
Originally I thought they were supposed to be fastened using the same pattern as you'd use on a motorbike helmet (if you've ever used a motorbike helmet, you'd know what I mean). That would make them extremely secure. However, it looks like you're just supposed to fold the excess strap back under both loops. It's still very secure.