5121 Size: Large Features: -T-Strap.-Built-in t-foam (temper foam) that is compressed by the strap over the vulnerable forearm muscles and tendons normally exposed to vibration from power tools.-With a unique expanded viscoelastic polymer T-foam that absorbs impact.-Provides maximum support exactly where it"s needed.-T-foam"s self-molding nature ensures balanced, total contact over the tendons.-Adapts to the worker without adjustment.