Pro fit ijbonka is the first assos insulator jacket available in two specific pattern designs this is the cento version tailored to fit the slim pro cyclist build assos layering system als tips assos offers 7 climarange specific interactive body insulators preferably use the ijbonka with modinteractive6 however the als is a guideline using a lighter or heavier next to skin interactive body insulator you can perfectly calibrate to your needs and extend climarange use when riding co