Overall this is a great helmet for casual or road cycling. It meets important safety standards like MIPS. It’s very comfortable for long rides, I’ve had no issues for 70+ miles rides and gets good airflow to the head. Adjustment works well and keeps it tight on my head.My only knock on the helmet is the battery life on the rear LED light. It’s super bright and offers multiple blinking patterns. However I notice that I have to charge it before every ride if I’m going longer than 3-4 hours. That seems to be its max life. It’s a little annoying to have to do but not a big deal overallSo comfortable that I forgetI have it onEDIT 7/11/21I purchased the LED/Ghost helmet in matte black. I'll rate the individual components:***** (5-stars) Helmet itself - is comfortable & lightweight. I've ridden several times up to 75 miles/4.5 hours. It fits better than my Specialized Airnet and is supposedly a few grams lighter. I was able to mount my The I really liked it and still do after all but I decided to get this one because of that light. It doesn't charge, the port is clumsy and probably that's why it can't charge. Very cheaply made.I needed a new helmet, as I've been riding with a Bern Brentwood XXL helmet for about 4-5 years that's looking worse for the wear (I added pictures for comparison). I have a really big head, measuring around 24 inches/61 cm circumference when my hair's growing out - helmet selection is pretty limited for folks like me. I chose this Bell helmet for its mix of features (CPSC certification, MIPS, built-in LED, hi-vis paint) and that several sites/reviews specifically mentioned it being good for big heads.It fits well - snug enough that it won't slide off on a bumpy ride, but not so tight that it'll give you a headache. It sits well on my head and doesn't mess up my hair (I bike commute to work). The chinstrap is easily adjustable, and the fit dial on the back works as advertised. Bell says the large size should fit 8-62 cm/22.8-24.4 inch circumference heads, and that matches with my experience.Ventilation is excellent - this is a good helmet for sunny weather, but might be a bit too breezy for colder climates.I found it pretty easy to turn on the LED light without looking, but you have to long-press the button to turn it off. This might be a bit fiddly for people living in cold weather. LED brightness is on par with any other small light (not as bright as my Li-ion Cygolite Hotshot Pro, but brighter than my Cateye AA light).This helmet has been great. Sometimes I wear a little headband underneath to mop up my sweat and adjusting the helmet to accommodate the extra thickness (or lack thereof) takes all of 0.2 seconds. The sizing system is simple, but extremely useful.When I made the purchase, I thought the blinking light was kind of cheesy but I never ride without it on any more. It lights up my whole garage if I forget to turn it off. Battery life on it has been great also. Best guess is that I get 6+ hours per charge, but it’s never actually died on me so that could be close or way underselling.If I had a gripe at all, it leans more towards the “mushroom head” look than some others I see on group rides. Not enough to keep me from buying another if I wrecked this one, though. Purely aesthetic.The lid is very lightweight - it’s forgotten by the time I get clipped in. I love the peace of mind that the MIPS gives me. The ventilation seems pretty strong as well. It has been 90°+ for weeks and I haven’t really noticed my head heating up.Overall 9.2/10.Game changing helmet for me - it truly funnels sweat away from the eyes. With my previous helmets, I had serious issues on hot days going up longer hills because of the sweat dripping down my forehead and causing major burning in the eyes. Trying to remove glasses, wipe, recover. Yuck.With this Bell Formula helmet, one of the reasons I purchased was because it claimed better sweat management and it completely delivers. No more issues.Regarding size, I used a fabric tape measure from a sewing kit and according to the posted measurements I would just barely fit into a Small. Spot on when it arrived - size small helmet adjusted as big as possible, and it just fits.I have a round asian head and have a hard time finding both bicycle and motorcycle helmets that fit me. This one fits me well. The helmet itself is well built and lightweight. The LED light is re-chargable via USB, which is nice. I have yet to take it for a spin, but first impression is that it's a good quality helmet.It's so comfy, light and the build quality is great. look so premium.