Alpinestars really hit the mark with this jacket, the quality is fantastic and styling is superb, I totally love it. Perfect for summer as it lets so much air flow through it. The fit is perfect for me and extremely comfortable from day 1. I’m 5’10, around 13 and half stone and the Alpinestars sizing was telling me I was a size 54 (44” chest), so I ordered the 54, I tried it on and it fit really well, although I thought it could be a little more snug on the chest, i then ordered the 52 (42” chest) just to be sure, this fit absolutely perfect, nice aggressive fit without feeling tight, so I’d say it’s true to size. If you’re considering wearing an airbag, definitely go up a size. Returned the 54, SBS returns were super easy and quick. All in all, great jacket and great company to buy from. 10/10