These long underpants are so-called 'functional' underwear. It consists of a soft, lightweight combination material with enough elasticity to make it suitable for both men and women. In the right size, of course!
Thermal underwear today is a combination of smart materials, a high stretch factor, an ergonomic design and flat seams. In other words, high-level clothing technology that doesn't require extra underwear. Antibacterial, breathable, light and easily washable.
Specifically here, the focus is on climate regulating qualities. This is for all-seasons: excess heat leaves the body in a healthy way through the integrated (small) channels in the fabric, while moisture regulating properties keep everything dry.
It seems obvious to us, but we'll say it anyway: this is underwear. Under no circumstances do you wear only this. Not only because the aesthetics is not quite right, but mainly because undergarments will never offer the necessary impact protection, which you rightly expect from a motorcycle jacket.