From the NVii website:
A durable rubber block shoe made for rough conditions with a precision fit. The fit is tight and snug and your foot won't move inside the shoes. In the Forest 2 we have the Superfabric upper, ProtectOR support and our 3-compound midsole.
The rubber in the outsole is the sticky butyl rubber which gives you a perfect grip. The dobs are 6,5 to 7,5 mm high and have small horizontal lines on the top for superior grip also in wet conditions. The pattern of the outsole is made without any slick areas for best possible grip in all conditions.
The Forest 2 comes with our 3-compound midsole for best cushioning. Weight: 219 gr (UK8)