The Single Shoulder Sheath allows carry under one arm. A one inch strap of nylon and elastic wraps the other arm for stability. Putting a larger blade under the arm aids in concealment and is very fast on deployment, both cross body or reverse grip. Deployed folders can also be molded for states that don't allow concealed carry of fixed blades. Please send an email describing your needs and blade type, and we can get started on the project.