The SOG SEAL XR 12-21-01-57 is a large and tough pocket knife. The name comes from the famous fixed SOG SEAL knives, designed for the US Navy Seals. This is the pocket knife version of those fixed knives. Large, strong and impressive. That is the Seal XR. You easily open it with the flipper or thumb hole. As such you can quickly get to work.
The Seal XR is, as the name might suggest, enhanced with the XR-lock. This is a great lockings mechanism for both left and right-handed use. The great thing about the XR-mechanism is that the blade slightly sticks from the handle when you pull the lock back. With a slight movement of the wrist you can easily release the blade from the handle. In addition to opening the knife with the thumb studs and the flipper this is the third opening mechanism according to SOG.
In terms of materials SOG clearly thought about how this knife is used. The handle is made from FRN. This is a strong type of plastic, reinforced with glass fibres. The blade is made from American CPM S35VN steel. It retains its sharpness well and is nice and stainless. The matt-black coating prevents reflections. Great for the men this knife was designed for.