I've been thinking about getting a nice, full face helmet (helmets marketed for mountain biking seem like a good fit), but they seem like a pain to deal with at my destination. A lot of times I'll just loop my current helmet on my scooter completely unlocked, because it's cheap enough that I'm not really worried about it being stolen. The full face helmets I have been looking at are an order of magnitude more expensive though, and I wouldn't really feel comfortable just leaving it unlocked by my scooter. Does anyone have any recommendations on this? Or recommendations on other appropriate safety gear for my kind of riding?