For e- bike,seems ok but the large is still too tight for my nogginThis is a very nice helmet. The light works good nice and bright. Fits good just like the description.Great addition has a red light in the back excellent add onVery nice. Strong and durable.Comfortable and secure. Some bike helmets fit awkwardly, the fit of this helmet is just right. And it's very easy to adjust. Padding on chin strap is a plus, and the offset fastener is great and helps to keep from pinching my chin. The safety light on the back of the helmet is wonderful, and very bright and noticeable. I definitely recommend this helmet!The helmet is a good value fits well very adjustable comes with extra padding. Has enough ventilation holes to keep your head cool in the summertime.Have only charged the red tail light, I have not used the helmet yet. The problem is that and you can see this in the picture, once I charged the Red light the black flap that covers the charging port will not go back into place the place no matter what I do.. It's not that big a deal except that water will get in there and do damage. I'm probably gonna return this.I bought a few different helmet brands to see which one I liked best and this was the winner. Many helmets look and feel very bulk but this one has a small profile while still feeling like it provides plenty of protection. Hopefully I never have to test it. I love having the LED on the back of the helment built-in and chargeable with a micro USB port. I do wish it charged via USB-C now that most devices are moving to that standard.The LED has a few different modes: always-on, slow-blink, and fast-blink.