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The Alpinestars Nucleon back protector insert is the first of a redesign for all of Alpinestars' back protectors. One of the most notable upgrades for the Nucleon is a CE Level 2 certification. Available at Riders Discount with $49.95 MSRP, you can place an order for this back protector via our website, or give MIKE a call at 866.931.6644 ext 804. Is email more convenient? Send us a message through this forum or write to us at FORUM at RIDERSDISCOUNT dot COM, and we'll get back to you right away! Alpinestars focused on making these safer and lighter, the Nucleon back protector insert is noticeably lighter than the previous Bionic Air insert and as a bonus is CE Level 2 certified. This will work with any Alpinestars motorcycle jacket you have. The Nucleon is also contoured and moldable for a anatomically correct and adaptive fit that will conform to any back shape. Also notice the channel ventilation system to work in coordination with the jacket to aid in air flow through your back side. Sizing is based on height: -- 5'4" and under = small -- 5'5" - 5'11" = medium -- 6'0 - 6'6" = large A CE Level 2 back protector insert for less than $50 is a great deal, give us a call to order yours today!