Material denim with stretch stretch panels 100% KEVLAR® fabric at hip & knee material tested according to EN 17092:2019 Safety ultra flat knee protectors SAS-TEC SC-1/KA according to EN 1621-1:2012 upgradable with hip protector SAS-TEC SC-1/07 Comfort without crotch seam for comfortable sitting Other Features reflective tape inside for rolling up slim fit