Dainese do 4 sizes with their Wave Air back protectors. I'm happy with mine and will get another one when my current one is stuffed and it's seen 4 crashes so far. I take a Wave Air 12 with a large strap and I'm just on 6'. Here's their blurb:
Dainese WAVE AIR back protector
The highest levels of protection, light weight, ergonomics, and ventilation distinguish this racing back protector developed with suggestions from competitive motorcycle racings greatest champions. Homologated to EN 1621.2 Standard Level 2, this back protector has rigid external corrugated plates for better impact energy distribution and a lightweight core made of aluminum honeycomb and Astrosorb. Ergonomics and riding comfort are guaranteed thanks to jointed pads, a patented lumbar support joint, the perforation of the structure, the use of breathable fabrics, and ample volume adjustment possibilities.
length of back-protector:
WAVE AIR 13: for people with height over 185 cm
WAVE AIR 12: for people with height: 170 - 185cm
WAVE AIR 11: for people with height: 160 - 170cm
WAVE AIR S: for people with height up to 160cm
waist:
Size L: 90 - 110 cm waist
Size M: 75 - 88 cm waist
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