Nylon was our first choice for ClipLock Quick Release Guitar Straps. We chose automotive seatbelt material for its comfort, strength and durability. Unlike inexpensive polypropylene, nylon has a smooth, satin feel, allowing the guitar to slide freely during performance. The fabric conforms to your body and adds a new level of comfort, yet it is strong enough to hold over 150 pounds! DiMarzio ClipLock Quick Release Guitar Straps were the first to feature the heavy-duty plastic clip that allows you to easily change from guitar to guitar with a little fingertip pressure. It is the most secure and unique fastening method available to safeguard your guitar.