The GrovTec Trail Pack holster is made with 1000 denier nylon material. The padded Air-Mesh shoulder harness will fit over bulky jackets. It&';s side straps adjust to eliminate movement and distribute weight so your handgun is securely held and out of the way, yet accessible no matter how rigorous the activity. Adjusts to fit either beneath or on the outside of jackets. Retention strap is fully adjustable. Includes belt loops for versatility and extra ammo loops. Fits large semi-autos.