My needs : - To add a neck brace to my protective gear - To be able to wear the brace every time I ride. I live off my bike, I pretty much travel around, teaching and enjoying life. My bike is my primary, and often, my only transportation whether I am traveling one mile or 10,000. - To be able to wear it over a jacket or any combination of protective gear. - For it to be comfortable ( so I won't be inclined to 'not wear it this time' ). - For it to not restrict my view of the road or trail, to entirely contribute to safety, not add limits or increase risk. - For it to be durable and simple. About me and my gear choices : I am 5'5" (165cm), weigh about 150 lbs (68 kg), lean and muscular, wide back /shoulders, short neck. 40" (101cm) chest, 42" (107cm) chest with chest/back protector, 43" (109cm) chest with c/b protector, layer, and jacket. I decided to begin wearing armor attached to my body. I found most integrated armor I have tried to not stay in place well at all. I wanted versatility across all temps and weather and riding types. Armor I could use with a full heated liner, layers, and a wp/b outer shell or by itself on hot day trail riding, with or without humidity. "Commuting", on the street (long trips or short), dual sport riding, trails. I wanted good chest, lateral rib, back, shoulder and elbow protection on my torso. I chose and use the Leatt 5.5 Pro HD and Leatt 3DF elbow guards. I wear this under a wp/b shell, like the Klim Overland, the Traverse, or formerly, the FG Kathmandu. I also will stash the shell and wear this under (or over) the Klim Dakar Pro jersey, which has 840d cordura sleeves, elbows, shoulders and lateral rib coverage. Lower protection includes Forma Terra boots ( http://www.atomic-moto.com/Forma-Terra-Boots-Field-User-Review--Atomic-Moto_b_120.html), Leatt Dual Axis knee guards, and Forcefield Pro Action Shorts under Klim Dakar pants. I have wp/b shell to go over these. I wear a helmet. Interestingly, I am finding acceptance of wearing a neck brace similar to acceptance of wearing a helmet. Does wearing the helmet involve 'one more thing to put on'? Is it often less comfortable than not wearing one at all? Is it heavier and/or hotter than nothing? May it restrict your vision, compared to not wearing one at all? An excellent read on a crash and people deciding on the importance of cervical spine protection here : http://www.atomic-moto.com/hand-of-fate.html .....So, I decided to integrate a neck brace into my protective gear plan. I had to narrow the choices down, so after some research on neck braces that people have claimed to wear and/or were designed for over jacket wear, I came up with these three : the Atlas Air, the Leatt STX, and the Omega S1. I will give some information and describe my experience and thoughts on each brace. The Omega S1 http://www.omegabrace.com/s1streetbrace.html This is described as Omega's road/adventure touring brace. Omega uses an open front brace design, unlike many others. It weighs 638 grams and totals 705 with the harness. This was the middle of the pack in regards to weight. There is one adult size. Donning the brace involves placing it over your shoulders from the rear. Then the harness is clipped together using three clips, two on the front of the brace and one across the chest. The brace can be donned and doffed while wearing my helmet, although was much easier when the helmet was off. I found the design for adjusting the harness to be poor, tedious, and unnecessarily complex. And, for me, even with the brace adjusted all the way to its largest and lowest position, I found it necessary to use the harness to keep the brace from rising up over time. Adjusting the brace itself : It uses a strap that is much like seatbelt webbing in its construction,adjusting the strap was simple not requiring tools. Adjusting the front and back body yokes (to adjust table height) involved two different hex keys, 3mm and 4mm. The two front adjustments were difficult to access using the supplied hex key. With my anatomy (broad back/chest and short neck) and armor choice (see above), the brace would not fit properly on me. I had the most room with the Omega S1 when looking down, but had the most limitation when turning my head to do over shoulder checks of any of these three neck braces. Also, the yoke design that sits over the back, shoulders and chest felt confining, and limited my thoracic mobility. Some may argue that many spinal injuries on motos are due to torsional rotation and may speculate this limited thoracic mobility I experienced could be a good thing. I felt it limited my ability to stay safe and see and respond to hazards. With my body and my armor choice, I did not find the Omega S1 to meet my needs. I suspect it would fit someone with a longer neck much better. The limitation on over shoulders checks for me was simply too much. The Omega S1 was usable with a backpack but not the most comfortable of the three braces with one on. The Leatt STX http://www.leatt.com/shop/braces/street-stx/stx-road-870.html The brace I evaluated was the Leatt STX Road, Jason Britton version. The Leatt STX is often also described as the "street/adventure" brace offered by Leatt. The brace comes in several sizes, I chose a L/XL. It has widely placed scapula braces to the rear and what is described as a relief for a jacket zipper in the chest brace portion. Speaking with Leatt on the phone, a representative stated that the STX series is fully compatible with the Leatt 5.5 Pro HD protector I wear. I found this to be accurate as it fit nicely in the chest slot on the protector and the scapula braces sat on the plastic of the back protector, to each side of the center slot. It has two red releases, on on each side and the brace can be put on or taken off by opening one please or both. I found this brace somewhat difficult to put on or take off, having to have a particular approach angle as I brought the brace to my head and neck. The neck opening was also definitely the narrowest of the three braces reviewed. I found the brace to allow the least cooling airflow of the three. I could not do either on or off with my helmet on. The Leatt STX Road Jason Britton I had weighed in at 808 grams (without harness) the heaviest of these three braces. I could definitely feel the weight of this brace, it was far more noticeable than the other two. It felt heavy and also confining. I found it to also limit my over the shoulder checks, but not as much as the Omega S1. The Leatt STX Road Jason Britton also limited my looking down ( although this seems to be my least used range of motion when riding). The harness included used two buckles and was easy to use with a jacket on. I chose not to use the harness with this brace. The elastic straps on the shoulders of the Leatt 5.5 Pro HD protector I wear would slip off the shelves on the STX where the straps are supposed to sit and help hold the brace in place when you are just wearing the protector. Brace adjustment was the most complicated but certainly not difficult. The Leatt seems to have high build quality and the most complex design. Although integrating well with the protector and working well over a jacket, I did not find the Leatt to meet my particular needs. Hefty, uncomfortable, and complex. The Leatt STX Road Jason Britton worked with a backpack but the least well of the three braces, in my opinion. I think this was due to the width of the scapula braces. The Atlas Air http://www.atlasbrace.com/atlas-air/ The Atlas Air is marketed as providing "unmatched comfort and mobility". I have found numerous reports of people wearing these over jackets and over/in many manufacturer's chest / back protectors. The Air comes in several sizes, I chose a Large. For times when I am not wearing the brace over my jacket, the Atlas Air chest braces fit well in the chest slot on the Leatt Pro HD. The rear braces of the Atlas sit nicely on the plastic of the center slot. I am also able to wear either the Leatt STX or Atlas Air braces in the front slot of the protector with my jersey on or with my jacket zipped up to the front of the brace. The Atlas Air fit and worked well over my jacket (which is always over the protector). Adjustment was quick and easy with a 4 mm hex. The Atlas Air has a red release button on the front of the brace but easily dropped over my head (sans helmet). Simple and fast. If donned this way there are no pieces or latches to manipulate. The harness included with the Air is a hybrid cross x design that would not be easy to use with a jacket as you slip your arms in to it, no buckles. Essentially the harness puts two thin elastic straps over your shoulders that hook into the hooks on each side of the brace table and would help hold the brace in place. Interestingly, the elastic straps on the Leatt 5.5 Pro HD protector fit perfectly in the hooks on the Air....even better than the protector's straps fit on the Leatt STX brace ( they kept slipping right off). I choose to not use a harness with a neck brace, if possible. The Atlas Air I use weighs in at 616 grams (without harness). The lightest of the bunch. It is marketed as weighing 599 grams. I had the least restricted visibility with this brace. The brace does limit my looking down some. Over the shoulder checks went with ease and I get no restriction of my thoracic mobility. The Atlas Air did meet my needs and is the brace I chose to continue to use. It is, by far, the most comfortable ! ...being the lightest, largest neck opening, least confining, and allowing great airflow. It is the easiest to put on and take off. The design and product is super simple and robust. The Atlas Air was the most comfortable of the braces reviewed when wearing a backpack.