Schwinn Insight LED Lighted Bike Helmet for Youth & Adults - Adjustable Fit 54-62cm Head Circumference - Multiple Color Options - Perfect for Cycling, Commuting & Night Rides

My head is large, but not XL. I wear hat size 7.5, which is 60cm in circumference. This helmet is slightly too small for me. The sides are snug with the adjustment band loosened all the way. More importantly, the height is shallower than other bicycle helmets and more of my head is exposed even when the top of my head is firmly pressed against the inside of the helmet.Weight of this helmet is 11 ounces, compared to 8 ounces for another helmet that I own. The extra weight is noticeable on my head. I presume that most of that weight is for the lighting system.Most other lighted helmets that Amazon sells have a simple light that clips on to the back of the helmet. This helmet is much fancier with an array of lights and all the wiring built into the helmet itself. The lights cover a wide are of the front and back of the helmet and appear brighter than with other helmets. There are a few different lighting modes with the very obnoxious mode hopefully giving you a better change of attracting the attention of distracted drivers. Unfortunately, the manufacturer does not say how long the battery lasts. I will try to add that information after I do more testing.For the price, this helmet is pretty nice. I just wish the large was larger.Got this for my girlfriend - her head circumference was right on the edge of a Medium or Large almost exactly at 22-3/4". We were went for the large, and were pleased to find that there's plenty of adjustability for this to fit her head well and is still comfortable.The lighting features on this make the helmet very visible at night from both the rear and the front, and it looks cool. The removable piece in back to charge it is kind of a hassle to get back in - it's just finnicky to get it just right, but the trade-off is that it's secure and doesn't seem likely to accidentally fall out if it's put in right.This is her first bike helmet, and she really likes it.This fits well and is adjustable to make it a snug fit. The lights on the back are good for night riding. It has a lot of spaces in the top that allows for good circulation.