Hayabusa's Weld3 Fight Shorts are constructed using sonic welding also known as thermal bonding. This construction technique reduces friction induced chafing with an ultra-smooth surface and does not sacrifice strength and durability. These shorts employ a silicon waist lining to prevent slippage and maintain a secure fit. Finally, the fabric-fused graphics keep these shorts looking good longer. The revolutionary advances these shorts boast make them a great addition to your fight gear collection!