while the bull pen and base covers are rectangular and square in form. Regardless of the material, usually these covers have reinforced edges of some kind with grommets around the perimeters 2 to 5 foot on center. The grommets allow the tarps to be staked into the ground if applicable. Full baseball field covers are a little bit different. The smallest size is usually 120 feet by 120 feet. The weight of these covers makes it necessary to have handles around the perimeter about every 12 feet. The largest size for baseball is 170 by 170. The handle spacing is the same. The advantage of the poly covers is that they are lighter than the vinyl’s, denser, and less expensive. Disadvantages include the facts that they rip easier and cannot be patched because they are so dense. Also, paint will not adhere to them so logos’ cannot be painted on them. A vinyl cover may cost twice that of the poly, but because it can be patched it is virtually indestructible and will last years longer. The ability to logo vinyl tarps is not in question. Most major league teams have the vinyl. Minor league to pee wee league usually gets the poly. Infield practice tarps are also used. These are trapezoidal in shape and come in different sizes. The use of this tarp allows the grass to not get chewed up while the infielders are taking ground ball practice. This type of tarp is a mesh to allow the grass to breath while it is on the field. The type of material is vinyl coated polyester. Football covers are made from either polyethylene or vinyl. The same reasoning as the baseball covers applies here. Because of the size and weight of these covers, they come in 30 yard lengths and overlap about 5 feet where they intersect. Handles are again every 12 feet.