Great product, comfortable and very good quality!The EVS Sports R4 Race Collar is nonintrusive and limits the front to rear and side to side range of motion of your helmet limiting the risk of neck injury. I decided to purchase this for off-road motorcycle riding after suffering a severe neck injury while mountain biking. The EVS Sports R4 Race Collar is kept in place with a chest strap system. It is barely noticeable and inspires confidence while riding in difficult terrain.Bought for a giftI wear an Alpine Star armored mesh under jacket. It has hard armor on shoulders, elbows, chest and back. The back plate interfered with this neck protector. It is a well made piece and a good value for the cost. It did not match up with my other ride gear.Great product, but size adult is to big for my neckI bought this to use as a neck brace for karting. I purchased a Valhalla 360 Plus and didn't like the build quality or the need for under arm straps, so I decided to give this collar a try. Immediately I noticed the high build quality and construction. When I tried it on, it was very easy to attach, very comfortable, and light. When I added my helmet to the equation (Stilo ST5), that's when I became very disappointed. The collar did a great job restricting forward and aft movement of the head. When I rolled my head left and right, I noticed that the collar easily slid under the edge of the helmet and contacted my jaw. This concerned me because a side impact could cause the helmet to miss the collar and allow the collar to impact my jaw, creating the potential for jaw related injury. This was not an issue with the Valhalla 360 or the run-of-the-mill cheap neck roll. As much as I really wanted this to work, I decided to return the product and use my Valhalla 360.This product would have been perfect for me if the base was wider on the shoulders to prevent it from passing under the edge of the helmet. If lateral loads/impacts are not a concern for you, I'd recommend this product.La comodidad es perfecta, justo para mi medida y una excelente inversión para no tener problemas lumbares mas adelante. Ahora falto probarlo.A********Perfect for mx the harness holds the brace down whilst you fly over jumpHaven't had to use it in a wipe out. I hope I will never have to! Knock on wood. It's a good built, quality product. It's comfortable and does not obstruct my ability to look left and right. It seems to be very effective at limiting how much my neck can snap in any direction in the event of a wipe out. Giving it 4 stars because it would be more comfortable using it with an EVS chest guard compared to my Thor chest guard.Device will not stay in place if used in a kart. There are versions out there that come with a harnas/straps that keeps it in place. This one does not.It literally broke few seconds after get out of the box when I tried to open it to try.The opener doesn’t show indication of pull/push and you have to guess how it works, ended breaking it unfortunately.Other than that, it does the work in terms of protection.