Vented, poly mesh outer shell construction. 840 denier ballistic nylon panels in the knees provide additional abrasion resistance. Removable, full-length H2O Blok. waterproof/breathable liner. Sas Tec CE. approved SC-01/02 removable armor in the knees and SC-1/07 in the hips. NightViz. reflective piping on the lower legs for increased night time visibility.