Purchased for summer touring in Spain. It's a compromise between not feeling overheated in leathers or textiles and being able to function when the temperature is + 30°C. Richa says this jacket can be worn underneath another layer. I could get a Richa Infinity jacket of the same XL size over it but with armour it would be too bulky and impractical. I'm 6'1" and nearly 14 stone. XL is right size as the fit is meant to be 'snug'. The jacket sleeves are very close fitting. You will be cold with minimal base layers in anything but Scorchio summer use.