The nice part is that with the breakaway aspect of it, it didnt injure my rear wheel or the spokes
Its quite comfortable to wear, too - about right in terms of fit for my particular head, with no hot spots anywhere, and the lining is very plush
The number of LEDs lit indicates the charging progress
Of course, if Im traveling and decide I need a third pair of underwear, its usually easy to buy a new pair for cheap just about anywhere
It also has on-the-go essentials: a compartment for your power bank and USB charging port, a reflective stripe on the front (safety first), a luggage handle pass-through slot at the back, water-resistant material, and a clamshell design that opens out flat for easy packing and unpacking