Hip Armor is designed to be used in Cortech apparel with pockets for installing the hip armor.
The Elbow or Knee Armor piece is for use in either pants (as knee armor) or jackets (as elbow armor) with pockets to hold the armor in place.
The Knee Armor with Velcro® units are made to fit pants that have Velcro inside the armor pocket to secure the armor in place inside the pocket.