Giro Radix MIPS Adult Dirt Bike Helmet

Minimal mushroom head even with skinny face. Very comfortable and nice fine adjustments on the fly. Takes a little break-in to for the internal system to soften and form to your skull. Seems to be a well known reputable brand that I trust over the cheaper generic brands, especially when it come to certification standards.

After some shopping and research, I went with the Radix primarily for two reasons. First is that the sizing. I wanted a fitted helmet, not a ‘One Size fits most’. I figured getting a fitted helmet would be more comfortable and more secure. My head was right at 56 CM and the medium fits me well. The second reason was colors. Other models, like Fixture, had some real issues with grey and the visors not color matched to the helmet. The Radix had some great colors and I kept going back on forth. I went with the two-tone grey/lime. I really like the color. The top is a is a dark matte grey and the lime is more green than yellow, but is glossy in finish. Overall happy with the helmet. Good price, good ventilation, looks good, and good adjustability from the Roc-Loc.

My head is basically exactly at 23in so I took a gamble getting the medium size instead of the large since it was cheaper and in a cooler color. The size guide says medium only goes to 23in for the biggest and large is 23in at the smallest. After getting it though the box says 21.75-23.25in. So it fit perfectly! If you're head is in-between the two sizes, keep in mind that the medium actually goes up to 23.25in and not 23in.The helmet looks great, fits perfect, and is exactly what I was hoping for! Would recommend!

I have been riding with a fox helmet for the last 7 years, and I always bike through the winter without one because it is not large enough to fit over a beanie, and no one will make a large enough helmet, and I don't want to sweat inside a ski helmet, even though they really look cool. After looking for smith everywhere and never being able to find the XL version, I finally found this, and ordered the largest size. It fits great at about 23.5" with nothing but a bandanna, and the mips is a huge huge improvement in comfort, and was very easy to adjust. I did not think I would like the "y" connectors beneath the ears, but they actually work really well. Set the female buckle side first, pull the cord through to the other side, set the other side, and clip off the excess webbing, and singe the end with a lighter; good to go. The visor flips up just enough to fit a headlamp for night riding, and the helmet tilts back and fits large snow goggles. The only complaint I had, was...why don't helmet manufacturers put headlamp and goggle guides on every single helmet? Haven't we figured that out yet? So I spent a day looking at all the terrible 3m glue things that I know will melt and mush off my helmet and make it look like crap, and then I finally settled on using black midgrade size zipties, the 8" black ones. You can position them and route them under the mips so you don't feel them. If you are looking at the helmet from the rear, don't use the middle holes, but the holes to the left of the middle, and to the right of the middle. And that would be the holes on the upper and the lower, with the middle ones left open. So you put four ties, one in each corner, and position the part that zips down so the nub is sticking out. They make perfect little permanent non-glue goggle and headlamp catches, and it doesn't clutter up the helmet and make it look bad. I also added two on the front where the visor flips up, in the center hole, so you can shake your head like crazy as if you were riding over logs, and now your headlamp won't slide off the front of the helmet and slap you in the face. 6 zipties, and you are good to go. Awesome helmet, so comfortable and easy to adjust. Incorporate goggle straps and it is great!

Commuter, low speed recreational cyclist here. I like the color and it doesn't look horrible. Lets be honest, all bike helmets look dorky, but they are important safety gear that should be worn. The Roc Loc system let me dial in the helmet for a comfortable and secure fit. This is so much better than the last helmet I bought in the 90's. I don't want to put it to the test, but if I crash, I feel that this helmet will protect my melon.

The last couple of years I've been riding to work more. This will be the third Giro helmet I've ever owned in 19 years. I bought a Smith Optics Convoy and it broke after a little over 2 years. That is the lower end line of Smith helmets. It was great helmet and glad I tried it. Giro has a much better fit and finish that the Smith. I also bought Giro helmets for my kids last year.Compared to the Smith the Giro just fits better. It probably weights about the same, has about the same air flow. The biggest difference you can really tell is the adjustment in the back. The clicks are much smaller on the Giro than the Smith. Which means you have a finer adjustment. I ride to work and when it gets cold I wear a skull cap. The Smith felt a little better with the cap on but the Giro feels way better with the cap off. Probably should go a size up with you ride with a skull cap often with this helmet. I mostly ride without, and typically stop riding to work during the winter months.Overall, a helmet is a helmet buy what you can afford and look for deals. I like to look for year old helmets or discontinued helmets because you'll get a major discount. Giro has been in the business for a long time and has more options that you can think of but if you catch it right you'll find a hundred dollar helmet like this one for fifty or sixty bucks. That's about what I like to pay for a helmet. Sure Smith and Giro have a hundred plus dollar helmets which will be better but always shop around and find a deal on those or some of their middle or lower end helmets. Happy helmet hunting.

good fit, could use a little longer bill for the morning sun

Very comfortable, lightweight and good looking.