HAZARD 4 Stabilizer Strap(TM) For Sling Packs and Messengers by (R) Prevents shoulder/sling bags from sliding forward from user's back Secures bag towards the lower back, especially when heavy Quick-attach between bag's shoulder strap and bag's lower D-ring (adjustable length and quick release buckle) Quick-release nylon buckle for fast on-off with high-quality webbing Main Material: High-Quality Nylon