Vietnam Click to see full answer. Herein, where are 5.11 clothes made?5.11 clothes now made in Vietnam – AR15.COM. is Propper made in the USA? Propper is a manufacturer of clothing and gear for tactical, law enforcement, public safety, and military applications. Since 1967 it has been one of the main uniform suppliers to the United States military. Considering this, where does the name 5.11 come from? The name “5.11” comes from the highest rock climbing difficulty level that was listed in the Yosemite Decimal System at Yosemite National Park, which was developed by Robbins in the 1950s.What are 5.11 pants made of?The Stryke Pant is multipurpose and one of 5.11’s best selling pants. Each pair is crafted from 5.11 Flex-Tac™ fabric, a specialized proprietary blend of mechanical stretch polyester and cotton engineered to provide extreme durability and performance in the field.