Max Grow designers knew from prior experience that excessive heat retention was the cause of most of the problems of other shelters. They therefore formulated a polyethylene material that had just the right color and density to promote good tree health.

One of the potential drawbacks of the tube style tree shelter is that it cannot be opened up. This means that another method of allowing fresh air to circulate around the tree needed to be found.  That's how venting came about. Venting is a simple solution but one that is vital to tree health. A vented tree protector enables the circulation of fresh air through the holes in its wall while at the same time preserving most of the moisture around the tree. For applications where moisture needs to be preserved to an even greater extent (e.g., arid, desert-like environments) Max Grow can be supplied unvented.