Great fit and very comfortable!! I am 5'8" 150lbs and bought a medium size to go inside my Alpinestars Atem full suit size 40US/50Euro. The KR-R is the full race without shoulder straps. I didn't use the top snap which is best to use with a jacket. Simply secure it to you with the velcro waist straps first, then put on your suit. If you want someone to secure the top snap that's fine, but not needed. With the Atem suit or jacket, air blows down the vented aero hump and into the thick vented core of the KR-R creating a cool micro climate inside. Get the optional KR-TB tail bone protector also with the KR-R, it attaches by velcro and tucks in a full suit nicely. You can use the KR-R top snap with a jacket and put both on all at once without someone snapping it for you. It's just tough to do with a full suit. Step up to this higher rated Level 2 from a Level 1 back protector from Alpinestars, it's really amazing and a must have! Motosport ships fast and is a great company to buy from!!
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There have been no questions asked about the Alpinestars Nucleon KR-R Back Protector.