I have not worn them yet, but I tried them on and they seem very comfortable. The battery packs for the lights are in the back of the bottoms. They DO NOT weigh down the bottoms at all. There are two battery packs that each control the front lights or back lights. Very Very COOL can't wait to wear them out!
super cute, got tons of compliments, absolutely obsessed with the lights! Only problem is the lights kinda move around and can get bunched up in areas so it can look kind of weird at times, but honestly not a big deal