Light weight. In terms of ventilation needs to be testedI purchased a large in the orange color.This replaced a ~2006 Bell helmet that had served me well but after more than 15,000 miles and 13 years it was time for a replacement. I expect this helmet to last 3 times as long considering it cost more than 3 times as much.Fit: I have about a 58CM head so I am right at the limit of the medium size. My Bell was a medium but I opted for the large as I couldn't find an LBS that carried this model so that I could try it on. I even had LBS try to order both sizes for me but they couldn't get it done. In the end I still don't know if the large is the best for me.The large does fit snug but it has plenty of room. I'm almost certain that the medium would have fit and it would have been lighter. However, the large has been nice for the extra space. My gutter band has not been pinching and I will have space for a winter beanie if necessary.The ride:The ventilation is a welcome upgrade. I suffer greatly in the heat and this helmet is as airy as I could imagine. The added benefit being that apparently it has really good aerodynamics which I think I've noticed already.The straps:Went with POC for the straps. No more twisted strap. Their strap design fits flush along the cheek. However, I am concerned that the strap material is too soft. While it feels nice against the skin, I don't know that it is going to hold up to the abuse that I am going to give it. We will see.I've seen comments about an issue with the fit of the straps. Not sure what that has been about. I've noticed no issue.Other thoughts.I love the orange. It will help alert drivers and it is going to look pretty cool when it starts to fade. Being able to comfortably place my sunglasses in the helmet with ease is a very welcome change. I considered knocking off a star for the price because it is very expensive but ultimately I have no remorse.Will update if I find a reason to.Update 6/4/20: Still loving this helmet!One of the most comfortable helmets I’ve ever worn.Way better than the mits system.Ventilation super.Keeps my head cool and dry due to air flowing through helmet.Most helmets I put on feel like a portabella mushroom.Not so much with this.Only draw back is the price!$$$I researched a LOT of helmets before this purchase and I’m very delighted with my POC helmet! The look of this helmet is streamlined and is very different, yet so much better than traditional styling. It’s actually very stylish and not at all as ugly as past cycling helmets, I expect ALL makers to follow suit and soon be offering the same styling! I measured my head as suggested and out of the box the fit was perfect! I could not feel this helmet on my head for a 32 mile ride, that’s how light & unobtrusive it is. I rated this helmet a 1 for warmth because it’s NOT a helmet designed to be warm, it’s designed for airflow and use in warmer climates, however I live in central/southern Utah and made this purchase the end of November when temps have been 41F to 54F...all I did was add a cap with ear flaps under the helmet and I was toasty warm! So far this has been a perfect helmet for me, my only regret is that I didn’t purchase the POC goggles that match and fit the helmet at the same time I bought the helmet. Truly my most exciting cycling purchase to date outside of my new Trek bike!Bought this on the recommendation of my son. Very well made but no more noticeable ventilation than my Gyro helmets.This item fit my head right out of the box. No messing with it. Light weight. My Revo sunglasses stay put in the "garage". I have an oblong shaped head. Other brands such as Lazer and Giro were too wide and my head could move side to side. This helmet stays put without having to crank down on the adjustments to make it tight. I would definitely recommend.Great helmet, had to order a large and I always wear a medium.I started cycling regularly at the beginning of the pandemic (like a lot of other people). I only had a commuter type helmet but really wanted something with more venting for this Spring/Summer. I read good reviews about this line including the fit with the ears. It JUST fit! I actually have to tuck my ear in a bit. I really wish there would be some adjustment. I may try to customize it...Venting is awesome, looks great, lightweight.I received this helmet very quickly after my purchase. It arrived in perfect condition in the manufacturers packaging. The helmet is very comfortable and lightweight - and allows a great deal of airflow through the helmet to keep you cool. I chose the red colour to help make me more visible out on the road.Best helmet EVER ! Fast shipping ! Thanks