This is one of those products which you basically just want to put on and then not notice until you need it in case of a crash. The Alpinestars NUCLEON KR-R (can see the racing heritage just in the name!) hybrid back protector fits great, is well ventilated and fits comfortably under a leather suit or jacket. Both myself and my friend Reno Wideson wore one at a recent track day without any complaints. Quality is top notch as you would expect from something designed for the race track and even though you don’t see it under your suit, the design looks good too. It is has some adjustability but it fit me fine as it was.
It retails for 149 Euros and you can buy one or find out more about it on the Alpinestars website here: http://www.alpinestars.com/nucleon-kr-r-protector
Ergonomically profiled the NUCLEON KR-R hybrid back protector is an innovative track and race back protection system CE certified Level 2 to the latest back protector standard revision and incorporating a multi- compound construction for excellent performance fit.
• Track and race back protector CE certified Level 2 to the latest back protector standard revision (EN1621-2:2014).
• With performance cooling, flexibility and anatomical contouring, this hybrid of hard shell and energy absorbing viscoelastic memory foam is lightweight and breathable for optimized protection and comfort.
• Features include waist adjustment for customized fit, a snap-on system to fix protector to a suit or jacket and a slim vented kidney belt for added security.